Hand, Foot, and Mouth Disease(HFMD)Phase 3NCT07611513
Protective Efficacy , Immunogenicity and Safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell).
A Phase 3 study testing Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in people with Hand, Foot, and Mouth Disease(HFMD) and Herpangina, run by Sinovac Biotech Co., Ltd at 5 sites in China.
Trial summary
This multicenter, randomized, double-blind, placebo-controlled phase IIIa clinical trial aims to evaluate the protective efficacy , immunogenicity and safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in Children aged 6 to 71 months. Read more about this study
- Who is it for?
- Ages 6 to 71 monthsHealthy volunteers can take part
- Conditions the study is for
- Hand, Foot, and Mouth Disease(HFMD), Herpangina
- What is being tested?
- Tetravalent Inactivated Enterovirus Vaccine (Vero Cell)
- Type of treatment
- Vaccines, Injection or infusion
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 6,000 participants
- Where
- 5 sitesChina
- Study dates
- May 2026to Sep 2028
- Phase
- Phase 3
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 6 to 71 months
- All sexes
- Healthy volunteers accepted
- Child
Who may be able to join
- Healthy children aged 6 to 71 months.
- Guardians who can understand and voluntarily sign the informed consent form
- Willing and able to comply with all visit schedules, sample collection, vaccinations, and other trial procedures。
- Provide legal identification for the participant and their guardian
Who cannot join
- A known history of HFMD/HA
- Uncontrolled chronic diseases or a history of severe illnesses, including but not limited to cardiovascular diseases, blood disorders, liver or kidney diseases, digestive system diseases, respiratory system diseases, malignant tumors, or a history of major functional organ transplantation.
- Autoimmune diseases, immunodeficiency diseases (including but not limited to systemic lupus erythematosus, ankylosing spondylitis, autoimmune thyroid diseases, asplenia, functional asplenia, and HIV infection).
- Abnormal coagulation function (such as coagulation factor deficiencies,and platelet abnormalities).
- Suffering from/having a history of severe neurological diseases (epilepsy, convulsions, or seizures [excluding a history of febrile seizures]) ,psychiatric disorders, or a family history of psychiatric disorders
- Various acute diseases or exacerbations of chronic diseases within the last 3 days.
Show all 14Show fewer
- Having been vaccinated with a vaccine containing any of the components EV71, CA16, CA10, CA6.
- Having received ≥14 days of immunosuppressive or other immunomodulatory treatment (prednisone ≥2mg/kg/day, or its equivalent; local or inhaled corticosteroids excluded) within the past 6 months, or cytotoxic treatment, or planning to receive such treatment during the trial.
- Having received immunoglobulin or other blood products(excluding hepatitis B immunoglobulin) within the past 6 months, or planning to receive such treatment during the trial.
- Having received other investigational drugs or vaccines within the past 30 days, or planning to receive such drugs or vaccines during the trial.
- Having received live attenuated vaccines or nucleic acid vaccines within the past 14 days, or subunit or inactivated vaccines within the past 7 days.
- Known allergy to any component of the investigational vaccine (inactivated EV71 virus, inactivated CA16 virus, , inactivated CA10 virus,, inactivated CA6 virus,aluminum hydroxide, sodium chloride, disodium hydrogen phosphate, sodium dihydrogen phosphate, injectable water).
- On the day of planned vaccination with the investigational vaccine, having an axillary temperature ≥37.3°C before vaccination, or other vital sign measurements outside the normal range,or the physical examination is not qualified.
- According to the investigator's judgment, participants have any other factors that make them unsuitable for participation in the clinical trial.
Trial locations and contacts
5 sites in 1 country. Contact the study team or a site near you to ask about taking part.
5 sites in 1 country
China5 sites
Fujian Provincial Center for Disease Control and Prevention
Fujian
Dongjuan Zhang, 13799327516, q3799327516@126.com
Anhui Provincial Center for Disease Control and Prevention
Hefei, Anhui
Henan Provincial Center for Disease Control and Prevention
Henan
Yanxia Wang, 13613816598, wangyanxia99@163.com
Hubei Provincial Center for Disease Control and Prevention
Hubei
Yeqing Tong, 13971078410, 63382251@qq.com
Sichuan Provincial Center for Disease Control and Prevention
Sichuan
Yulin Jing, 18081892339, 21820422@qq.com
About this study
Official title: Multicenter, Randomized, Double-blind, Placebo-Controlled Phase IIIa Clinical Trial on the Protective Efficacy , Immunogenicity and Safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in Children Aged 6 to 71 Months.
This multicenter, randomized, double-blind, placebo-controlled phase IIIa clinical trial aims to evaluate the protective efficacy , immunogenicity and safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in Children aged 6 to 71 months.
Participants will be randomly assigned in a 1:1 ratio to the trial group and the placebo group, receiving two doses of experimental vaccine or placebo , with a one-month interval between the two doses.
Read the detailed description
This trial employs a multicenter, randomized, double-blind, placebo-controlled design.With informed consent, 6000 children participants aged 6 to 71 months will be enrolled, with 2800 participants aged 6 to 23 months and 3200 participants aged 24 to 71 months, maintaining a balanced gender ratio. All participants will be randomly assigned to the trial and placebo groups at a 1:1 ratio, receiving two doses of experimental vaccine or placebo , with a one-month interval between the two doses.
Protective Efficacy Assessment: Each participant enters the case monitoring period after receiving the first dose of vaccination, which lasts until the end of two consecutive hand, foot and mouth disease (HFMD) epidemic seasons (i.e., the peak incidence period; bimodal epidemics occurring within the same year shall be regarded as one single epidemic season).
The valid case monitoring period commences on Day 15 after the second dose, and the period prior thereto is defined as the surveillance window period. During case monitoring , suspected cases identified through active follow-up by investigators or spontaneous reports from participants' guardians shall be subjected to nucleic acid testing using pharyngeal swabs and/or anal swabs collected once within 3 days after the initial onset of symptoms, with subsequent follow-up and specimen sampling conducted according to test results.
Safety Assessment: Adverse events (AEs) occurring within 30 minutes after each vaccination shall be collected from all participants. Serious adverse events (SAEs) will be monitored from the first dose administration until 6 months after the last dose, with SAE follow-up visits conducted once monthly. All AEs identified via spontaneous reports from participants' guardians or any other sources from the first dose up to 30 days after the last dose will be closely monitored, truthfully recorded and included in the analysis.
A total of 3000 participants will be enrolled in the reactogenicity subgroup, including 1400 children aged 6-23 months and 1600 children aged 24-71 months. On the basis of the above safety observations, participants in the reactogenicity subgroup shall record solicited and unsolicited AEs within 0 to 7 days after each vaccination using diary cards, and collect AEs occurring from Day 8 to Day 30 after each vaccination via contact cards.
Humoral Immunogenicity Assessment: A total of 600 participants will be selected from the reactogenicity subgroup into the humoral immunogenicity subgroup, consisting of 280 children aged 6-23 months and 320 children aged 24-71 months. Venous blood samples of 3.0 (±0.5) mL will be collected from participants in this subgroup at baseline before the first dose, 30 days, 6 months and 12 months after the second dose respectively. Sera isolated at the above four time points will be tested for neutralizing antibodies against EV71, CA16, CA10 and CA6 to evaluate immunogenicity and immune persistence. Sera collected before the first dose and 30 days after the second dose will be used to detect neutralizing antibodies against different enterovirus subtypes so as to explore cross-protective capacity. Meanwhile, 60 participants aged less than 12 months from this subgroup will receive all vaccinations at the anterolateral thigh, while the remaining participants will be vaccinated via the deltoid muscle of the upper arm, to analyze the differences in immunogenicity and immune persistence between different vaccination sites.
Cellular Immunogenicity Assessment:Another 80 participants aged 24-71 months will be enrolled from the reactogenicity subgroup into the cellular immunogenicity subgroup. Venous blood samples of 3.0 (±0.5) mL will be collected before each vaccination and on Day 14 after each dose administration. Blood samples from the first 40 randomly numbered participants will be used to detect the expression levels of EV71 and CA16-specific IFN-γ and IL-4 in T cells, and samples from the latter 40 randomly numbered participants will be applied to measure T cell expression levels of CA10 and CA6-specific IFN-γ and IL-4.
The primary protective efficacy analysis will be conducted when case monitoring for at least one epidemic season is completed, the total number of hand, foot and mouth disease cases caused by any serotype of EV71, CA16, CA10 and CA6 identified during the valid case surveillance period reaches no less than 73, and the number of HFMD cases induced by CA16 and CA6 infection reaches no less than 38 respectively.
- Conditions
- Hand, Foot, and Mouth Disease(HFMD), Herpangina
- Being tested
- Tetravalent Inactivated Enterovirus Vaccine (Vero Cell), Placebo
- Keywords
- Hand, Foot, and Mouth Disease (HFMD), Herpangina, phase IIIa, immunogenicity, safety, protective efficacy
- Medical subject headings
- Hand, Foot and Mouth Disease, Herpangina
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Tetravalent Inactivated Enterovirus Vaccine (Vero Cell)Biological
Two doses are administered with a one-month interval between each dose.
PlaceboBiological
Two doses are administered with a one-month interval between each dose.
| Study group | Role | What they receive |
|---|---|---|
| Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) | Experimental | 3000 participants aged 6-71 months will receive Tetravalent Inactivated Enterovirus Vaccine (Vero Cell).Route of administration is intramuscular injection at anterolateral thigh for infants aged younger than 12 months, and at deltoid muscle of upper arm for children aged older than 12 months. Receives: Biological: Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) |
| placebo | Placebo comparator | 3000 participants aged 6-71 months will receive placebo .Route of administration is intramuscular injection at anterolateral thigh for infants aged younger than 12 months, and at deltoid muscle of upper arm for children aged older than 12 months. Receives: Biological: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months starting from Day 15 after full-course vaccination during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by CA6 in children aged 6 to 71 months starting from Day 15 after full-course vaccination during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)From day 15 after the full-course vaccination to data cutoff date of primary analysis
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by CA16 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by CA16 in children aged 6 to 71 months starting from Day 15 after full-course immunization during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Secondary outcomes (26)
Evaluate the safety of the investigational vaccine
Incidence of adverse reactions within 0-30 days after each dose of investigational vaccine
Measured: From day 0 to day 30 after vaccination (The day of vaccination is defined as Day 0)
Evaluate the safety of the investigational vaccine
Incidence of serious adverse events (SAEs) from the start of vaccination until 6 months after the full vaccination.
Measured: From day of vaccination to 6 months after vaccination
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at day 30 after full-course vaccination
Measured: At day 30 after full-course vaccination
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at day 30 after full-course vaccination
Measured: At day 30 after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6 at 30 days after full-course vaccination
Measured: At day 30 after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6 at 30 days after full-course vaccination
Measured: At day 30 after full-course vaccination
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at 6 months after full-course vaccination
Measured: At 6 months after full-course vaccinaton
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at 12 months after full-course vaccination
Measured: At 12 months after full-course vaccinaton
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at 6 months after full-course vaccination
Measured: At 6 months after full-course vaccination
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6 at 12 months after full-course vaccination
Measured: At 12 months after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6 at 6 months after full-course vaccination
Measured: At 6 months after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6 at 12 months after full-course vaccination
Measured: At 12 months after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6 at 6 months after full-course vaccination
Measured: At 6 months after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Assess the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6 at 12 months after full-course vaccination
Measured: At 12 months after full-course vaccination
Evaluate the protective efficacy of the investigational vaccine against diseases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
The protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed diseases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months starting from Day 15 after full-course immunization during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against severe cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
The protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed severe cases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months starting from Day 15 after full-course immunization during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
The protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months starting from Day 15 after full-course immunization during the primary protective efficacy analysis stage.
Measured: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed HFMD caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against herpangina caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed herpangina caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against diseases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed diseases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against severe cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed severe cases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by EV71 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed HFMD caused by EV71 infection in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA10 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed HFMD caused by CA10 infection in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA16 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed HFMD caused by CA16 infection in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA6 infection compared to placebo.
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed HFMD caused by CA6 infection in children aged 6 to 71 months, from Day 15 after full-course immunization until the end of two consecutive epidemic seasons.
Measured: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted28 May 2026
- Study startMay 2026 (estimated)
- Primary completionDec 2027 (estimated)
- Study completionSep 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Hand, Foot, and Mouth Disease(HFMD)Studies of the same condition, open and under way.
- More trials run by Sinovac Biotech Co., LtdThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 6,000 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Sinovac Biotech Co., Ltd
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
- Investigators
- Yanxia Wang, Principal investigator, Henan Provincial Center for Disease Control and Prevention
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07611513
- Sponsor's protocol ID
- PRO-QEV-3001
- Status last verified
- May 2026
- First submitted
- 17 May 2026
- Last updated
- 28 May 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 28 May 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Multicenter, Randomized, Double-blind, Placebo-Controlled Phase IIIa Clinical Trial on the Protective Efficacy , Immunogenicity and Safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in Children Aged 6 to 71 Months.
- ClinicalTrials.gov ID
- NCT07611513
- Acronym / sponsor ID
- PRO-QEV-3001
- Conditions
- Hand, Foot, and Mouth Disease(HFMD), Herpangina
- Keywords
- Hand, Foot, and Mouth Disease (HFMD), Herpangina, phase IIIa, immunogenicity, safety, protective efficacy
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 6,000 participants (estimated)
- Lead sponsor
- Sinovac Biotech Co., LtdIndustry (pharma, biotech, devices)
- Study start
- May 2026 (estimated)
- Primary completion
- Dec 2027 (estimated)
- Study completion
- Sep 2028 (estimated)
- First posted
- 28 May 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This multicenter, randomized, double-blind, placebo-controlled phase IIIa clinical trial aims to evaluate the protective efficacy , immunogenicity and safety of the Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in Children aged 6 to 71 months.
Participants will be randomly assigned in a 1:1 ratio to the trial group and the placebo group, receiving two doses of experimental vaccine or placebo , with a one-month interval between the two doses.
Detailed description
This trial employs a multicenter, randomized, double-blind, placebo-controlled design.With informed consent, 6000 children participants aged 6 to 71 months will be enrolled, with 2800 participants aged 6 to 23 months and 3200 participants aged 24 to 71 months, maintaining a balanced gender ratio. All participants will be randomly assigned to the trial and placebo groups at a 1:1 ratio, receiving two doses of experimental vaccine or placebo , with a one-month interval between the two doses.
Protective Efficacy Assessment: Each participant enters the case monitoring period after receiving the first dose of vaccination, which lasts until the end of two consecutive hand, foot and mouth disease (HFMD) epidemic seasons (i.e., the peak incidence period; bimodal epidemics occurring within the same year shall be regarded as one single epidemic season).
The valid case monitoring period commences on Day 15 after the second dose, and the period prior thereto is defined as the surveillance window period. During case monitoring , suspected cases identified through active follow-up by investigators or spontaneous reports from participants' guardians shall be subjected to nucleic acid testing using pharyngeal swabs and/or anal swabs collected once within 3 days after the initial onset of symptoms, with subsequent follow-up and specimen sampling conducted according to test results.
Safety Assessment: Adverse events (AEs) occurring within 30 minutes after each vaccination shall be collected from all participants. Serious adverse events (SAEs) will be monitored from the first dose administration until 6 months after the last dose, with SAE follow-up visits conducted once monthly. All AEs identified via spontaneous reports from participants' guardians or any other sources from the first dose up to 30 days after the last dose will be closely monitored, truthfully recorded and included in the analysis.
A total of 3000 participants will be enrolled in the reactogenicity subgroup, including 1400 children aged 6-23 months and 1600 children aged 24-71 months. On the basis of the above safety observations, participants in the reactogenicity subgroup shall record solicited and unsolicited AEs within 0 to 7 days after each vaccination using diary cards, and collect AEs occurring from Day 8 to Day 30 after each vaccination via contact cards.
Humoral Immunogenicity Assessment: A total of 600 participants will be selected from the reactogenicity subgroup into the humoral immunogenicity subgroup, consisting of 280 children aged 6-23 months and 320 children aged 24-71 months. Venous blood samples of 3.0 (±0.5) mL will be collected from participants in this subgroup at baseline before the first dose, 30 days, 6 months and 12 months after the second dose respectively. Sera isolated at the above four time points will be tested for neutralizing antibodies against EV71, CA16, CA10 and CA6 to evaluate immunogenicity and immune persistence. Sera collected before the first dose and 30 days after the second dose will be used to detect neutralizing antibodies against different enterovirus subtypes so as to explore cross-protective capacity. Meanwhile, 60 participants aged less than 12 months from this subgroup will receive all vaccinations at the anterolateral thigh, while the remaining participants will be vaccinated via the deltoid muscle of the upper arm, to analyze the differences in immunogenicity and immune persistence between different vaccination sites.
Cellular Immunogenicity Assessment:Another 80 participants aged 24-71 months will be enrolled from the reactogenicity subgroup into the cellular immunogenicity subgroup. Venous blood samples of 3.0 (±0.5) mL will be collected before each vaccination and on Day 14 after each dose administration. Blood samples from the first 40 randomly numbered participants will be used to detect the expression levels of EV71 and CA16-specific IFN-γ and IL-4 in T cells, and samples from the latter 40 randomly numbered participants will be applied to measure T cell expression levels of CA10 and CA6-specific IFN-γ and IL-4.
The primary protective efficacy analysis will be conducted when case monitoring for at least one epidemic season is completed, the total number of hand, foot and mouth disease cases caused by any serotype of EV71, CA16, CA10 and CA6 identified during the valid case surveillance period reaches no less than 73, and the number of HFMD cases induced by CA16 and CA6 infection reaches no less than 38 respectively.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) | Experimental | Biological: Tetravalent Inactivated Enterovirus Vaccine (Vero Cell)3000 participants aged 6-71 months will receive Tetravalent Inactivated Enterovirus Vaccine (Vero Cell).Route of administration is intramuscular injection at anterolateral thigh for infants aged younger than 12 months, and at deltoid muscle of upper arm for children aged older than 12 months. |
| placebo | Placebo comparator | Biological: Placebo3000 participants aged 6-71 months will receive placebo .Route of administration is intramuscular injection at anterolateral thigh for infants aged younger than 12 months, and at deltoid muscle of upper arm for children aged older than 12 months. |
Who may qualify
- Ages
- 6 to 71 months
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child
Key inclusion criteria (4 listed)
- Healthy children aged 6 to 71 months.
- Guardians who can understand and voluntarily sign the informed consent form
- Willing and able to comply with all visit schedules, sample collection, vaccinations, and other trial procedures。
- Provide legal identification for the participant and their guardian
Key exclusion criteria (14 listed)
- A known history of HFMD/HA
- Uncontrolled chronic diseases or a history of severe illnesses, including but not limited to cardiovascular diseases, blood disorders, liver or kidney diseases, digestive system diseases, respiratory system diseases, malignant tumors, or a history of major functional organ transplantation.
- Autoimmune diseases, immunodeficiency diseases (including but not limited to systemic lupus erythematosus, ankylosing spondylitis, autoimmune thyroid diseases, asplenia, functional asplenia, and HIV infection).
- Abnormal coagulation function (such as coagulation factor deficiencies,and platelet abnormalities).
- Suffering from/having a history of severe neurological diseases (epilepsy, convulsions, or seizures [excluding a history of febrile seizures]) ,psychiatric disorders, or a family history of psychiatric disorders
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Tetravalent Inactivated Enterovirus Vaccine (Vero Cell)Two doses are administered with a one-month interval between each dose. | Biological | Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) |
| PlaceboTwo doses are administered with a one-month interval between each dose. | Biological | placebo |
Primary outcome
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by any serotype of EV71, CA16, CA10 and CA6 in children aged 6 to 71 months starting from Day 15 after full-course vaccination during the primary protective efficacy analysis stage.
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)From day 15 after the full-course vaccination to data cutoff date of primary analysis
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by CA6 in children aged 6 to 71 months starting from Day 15 after full-course vaccination during the primary protective efficacy analysis stage.
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by CA16 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine versus placebo against RT-PCR-confirmed primary HFMD caused by CA16 in children aged 6 to 71 months starting from Day 15 after full-course immunization during the primary protective efficacy analysis stage.
26 secondary outcomes
Evaluate the safety of the investigational vaccine
Time frame: From day 0 to day 30 after vaccination (The day of vaccination is defined as Day 0)
Evaluate the safety of the investigational vaccine
Time frame: From day of vaccination to 6 months after vaccination
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At day 30 after full-course vaccination
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At day 30 after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At day 30 after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At day 30 after full-course vaccination
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 6 months after full-course vaccinaton
Evaluate the seroconversion rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 12 months after full-course vaccinaton
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 6 months after full-course vaccination
Evaluate the seropositivity rate of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 12 months after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 6 months after full-course vaccination
Evaluate the GMT of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 12 months after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 6 months after full-course vaccination
Evaluate the GMI of neutralizing antibodies against EV71, CA16, CA10, CA6
Time frame: At 12 months after full-course vaccination
Evaluate the protective efficacy of the investigational vaccine against diseases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against severe cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against herpangina caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against diseases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against severe cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine against hospitalized cases caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by EV71 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA10 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA16 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Evaluate the protective efficacy of the investigational vaccine versus placebo against HFMD caused by CA6 infection compared to placebo.
Time frame: From day 15 after full-course vaccination to the end of case surveillance period (December 31, 2027)
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 28 May 2026.
Related trials for Hand, Foot, and Mouth Disease(HFMD)
Not yet recruiting
CHIPCAT and HFMD-PREP for HFMD Prevention in Childcare Centres in Kota Kinabalu
Hand, Foot and Mouth Disease, Infection Control
Not yet recruiting
Bridging Clinical Trial of EV71 Vaccine in Vietnamese Children
Hand, Foot, and Mouth Disease (HFMD), Enterovirus 71 Infection
Not yet recruitingPhase 1
Phase I Clinical Trial of Enterovirus Type71 - Coxsackievirus Type A16 Bivalent Vaccine
Hand, Foot and Mouth Disease (HFMD), HFMD
Enrolling by invitationObservational study
Study on the Persistence of Immunity Following EV71 Vaccination
Hand, Foot, and Mouth Disease, Hand, Foot, and Mouth Disease (HFMD)
Recruiting
Clinical Trial of Pegylated Interferon α-2b Via Nebulization for Treatment of Hand, Foot, and Mouth Disease .
HFMD
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Yanxia Wang principal investigator
Henan Provincial Center for Disease Control and Prevention
5 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing Tetravalent Inactivated Enterovirus Vaccine (Vero Cell) in people with Hand, Foot, and Mouth Disease(HFMD) and Herpangina, run by Sinovac Biotech Co., Ltd at 5 sites in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 14 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 28 May 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 5 sites in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Yanxia Wang (13613816598, wangyanxia99@163.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Evaluate the protective efficacy of the investigational vaccine against HFMD caused by any serotype of EV71, CA16, CA10 and CA6 infection compared to placebo. (time frame: From day 15 after full-course vaccination to the data cutoff date when the pre-specified number of primary HFMD cases is reached (case-driven primary analysis)). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 May 2026.