Rabies Post-exposure ProphylaxisNCT07624461
Real-World Effectiveness of Zamerovimab and Mazorelvimab and Vaccine for Rabies Grade III Exposure in Nanyang
An observational study of Rabies Post-exposure Prophylaxis and Rabies, run by Synermore Biologics (Suzhou) Co., Ltd. at 1 site in China.
Trial summary
The objective of this real-world, prospective observational study is to evaluate the clinical effectiveness of zamerovimab and mazorelvimab injection (a human rabies monoclonal antibody cocktail) administered in combination with a standard rabies vaccine for post-exposure prophylaxis (PEP) in individuals with WHO… Read more about this study
- Who is it for?
- Ages 18 to 99 years
- Conditions the study is for
- Rabies Post-exposure Prophylaxis, Rabies
- What is being tested?
- Zamerovimab and Mazorelvimab Injection plus Rabies Vaccine
- Type of treatment
- Vaccines, Injection or infusion
- How many people
- 80 participants
- Where
- 1 siteChina
- Study dates
- 6 Jun 2025to Dec 2026
- How long will I take part?
- 1 Year
- Phase
- Observational
- 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 18 to 99 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: People aged 18 or older who were bitten by a dog that also bit others, have a serious (Grade III) rabies exposure, and already received wound cleaning, the antibody injection, and the first rabies shot within 24 hours can join.
Who may be able to join
- Adults aged ≥18 years at the time of screening.
- Sustained a verified WHO Grade III rabies exposure from a traceable offending dog involved in a multi-person canine attack incident (defined as a single animal attacking multiple individuals within a clustered timeframe/location) in Nanyang City.
- Time interval from Grade III exposure to post-exposure prophylaxis (PEP) initiation is less than 7 days.
- Successfully completed standard wound debridement, anatomical infiltration of zamerovimab/mazorelvimab injection (0.3 mg/kg single full dose), and the first dose of rabies vaccine within 24 hours prior to screening.
- Voluntarily provides signed written informed consent.
- Patient is willing and able to comply with all sequential follow-up procedures (including serum collections if applicable) and intends to reside locally for the full 1-year study duration.
Who cannot join
- Documented history of any separate animal bite or scratch (e.g., dog, cat, bat, or wild carnivore) within the past 12 months prior to the current exposure.
- Documented complete pre-exposure or post-exposure rabies vaccination history within the past 12 months.
- Concurrent presentation with life-threatening traumatic injuries requiring intensive care, or severe systemic immunodeficiency disorders that could impede immunogenicity or follow-up compliance.
- Any other clinical or psychological condition deemed by the investigator as unsuitable for safe participation or reliable data registry.
Trial locations and contacts
1 site in 1 country.
China1 site
The Disease Prevention and Control Center of Nanyang
Nanyang, Henan, 473000
About this study
Official title: Post-Exposure Prophylaxis Outcome of Zamerovimab and Mazorelvimab Injection and Rabies Vaccine in Grade III Rabies Exposure Cases From Single-Dog Multiple-Bite Incidents: A Real-World Prospective Study
The objective of this real-world, prospective observational study is to evaluate the clinical effectiveness of zamerovimab and mazorelvimab injection (a human rabies monoclonal antibody cocktail) administered in combination with a standard rabies vaccine for post-exposure prophylaxis (PEP) in individuals with WHO Grade III rabies exposure in Nanyang City, China.
- The study primarily aims to assess:
- The 3-month rabies-free survival rate following PEP initiation.
- The 1-year long-term rabies-free survival rate.
Read more
The rabies virus (RABV) carrying rate and genomic epidemiology among offending dogs involved in single-dog multiple-bite incidents.
Eligible participants aged 18 years or older who have sustained a Grade III exposure from a tracked multi-person canine attack event, and have completed wound debridement and initial passive/active immunization within 24 hours prior to screening, will be followed for up to 1 year via telephone or clinic visits to monitor clinical survival.
Read the detailed description
This prospective, multicenter registry study evaluates the real-world deployment, clinical protection, and safety profile of zamerovimab and mazorelvimab injection (ZM cocktail)- containing two non-overlapping human monoclonal antibodies-in community emergency settings. Rabies presents a near 100% case-fatality rate upon symptom onset, making immediate and high-potency passive immunization essential during the active-vaccine immunity window (Days 0-7). Recent regional epidemic resurgences underscore the public health urgency of handling single-dog multiple-bite clusters, where furious rabid animals carry high viral loads and inflict multiple deep lesions.Approximately 80 patients receiving routine post-exposure care will be enrolled. Participants will receive standard-of-care wound debridement, anatomical infiltration of the ZM cocktail, and a full rabies vaccine regimen. Joining this registry involves no additional clinical interventions beyond standard medical care; investigators will actively maintain follow-up contacts at 3 months and 1 year to document survival outcomes. Concurrently, trapped offending dogs will undergo molecular verification via reverse transcription polymerase chain reaction (RT-PCR) and next-generation sequencing (NGS) to map localized viral ecology, providing crucial real-world data to optimize outbreak emergency response frameworks.
- Conditions
- Rabies Post-exposure Prophylaxis, Rabies
- Being tested
- Zamerovimab and Mazorelvimab Injection plus Rabies Vaccine
- Keywords
- Single-dog Multiple-bite Incidents, Grade III rabies exposures
- Medical subject headings
- Rabies
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Zamerovimab and Mazorelvimab Injection plus Rabies VaccineDrug
Standard-of-care wound debridement, followed by anatomical infiltration of zamerovimab/mazorelvimab injection at a single dose of 0.3 mg/kg around the wound sites on Day 0, combined with a standard intramuscular rabies vaccine regimen.
| Study group | Role | What they receive |
|---|---|---|
| Grade III rabies exposure cohort | Adults (≥18 years) who sustained verified WHO Grade III rabies exposure from a traceable dog involved in a tracked multi-person attack incident, and who initiated standardized PEP within the protocolized window. Receives: Drug: Zamerovimab and Mazorelvimab Injection plus Rabies Vaccine |
What is being measured
The primary outcome is the main question the study is designed to answer.
3-month rabies-free survival rate
The proportion of participants alive and free of clinical rabies symptoms at 90 days following post-exposure prophylaxis (PEP) initiation.
Measured: 90 days (±3 days) post-enrollment
Secondary outcomes (1)
1-year rabies-free survival rate
The proportion of participants alive and free of clinical rabies symptoms at 1 year following post-exposure prophylaxis (PEP) initiation.
Measured: 365 days (±7 days) post-enrollment
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted3 Jun 2026
- Study start6 Jun 2025
- Primary completion31 Mar 2026
- Study completionDec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Rabies Post-exposure ProphylaxisStudies of the same condition, open and under way.
- 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
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 80 participants (estimated)
- Target duration
- 1 Year
Sponsor and investigators
- Lead sponsor
- Synermore Biologics (Suzhou) Co., Ltd.
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07624461
- Sponsor's protocol ID
- SYN023-RWE-001
- Status last verified
- May 2026
- First submitted
- 28 May 2026
- Last updated
- 11 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 11 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Post-Exposure Prophylaxis Outcome of Zamerovimab and Mazorelvimab Injection and Rabies Vaccine in Grade III Rabies Exposure Cases From Single-Dog Multiple-Bite Incidents: A Real-World Prospective Study
- ClinicalTrials.gov ID
- NCT07624461
- Acronym / sponsor ID
- SYN023-RWE-001
- Conditions
- Rabies Post-exposure Prophylaxis, Rabies
- Keywords
- Single-dog Multiple-bite Incidents, Grade III rabies exposures
- Study type
- Observational
- Recruitment status
- Active, not recruiting
- Enrolment
- 80 participants (estimated)
- Lead sponsor
- Synermore Biologics (Suzhou) Co., Ltd.Industry (pharma, biotech, devices)
- Study start
- 6 Jun 2025 (actual)
- Primary completion
- 31 Mar 2026 (actual)
- Study completion
- Dec 2026 (estimated)
- First posted
- 3 Jun 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.
The objective of this real-world, prospective observational study is to evaluate the clinical effectiveness of zamerovimab and mazorelvimab injection (a human rabies monoclonal antibody cocktail) administered in combination with a standard rabies vaccine for post-exposure prophylaxis (PEP) in individuals with WHO Grade III rabies exposure in Nanyang City, China.
- The study primarily aims to assess:
- The 3-month rabies-free survival rate following PEP initiation.
- The 1-year long-term rabies-free survival rate.
The rabies virus (RABV) carrying rate and genomic epidemiology among offending dogs involved in single-dog multiple-bite incidents.
Eligible participants aged 18 years or older who have sustained a Grade III exposure from a tracked multi-person canine attack event, and have completed wound debridement and initial passive/active immunization within 24 hours prior to screening, will be followed for up to 1 year via telephone or clinic visits to monitor clinical survival.
Detailed description
This prospective, multicenter registry study evaluates the real-world deployment, clinical protection, and safety profile of zamerovimab and mazorelvimab injection (ZM cocktail)- containing two non-overlapping human monoclonal antibodies-in community emergency settings. Rabies presents a near 100% case-fatality rate upon symptom onset, making immediate and high-potency passive immunization essential during the active-vaccine immunity window (Days 0-7). Recent regional epidemic resurgences underscore the public health urgency of handling single-dog multiple-bite clusters, where furious rabid animals carry high viral loads and inflict multiple deep lesions.Approximately 80 patients receiving routine post-exposure care will be enrolled. Participants will receive standard-of-care wound debridement, anatomical infiltration of the ZM cocktail, and a full rabies vaccine regimen. Joining this registry involves no additional clinical interventions beyond standard medical care; investigators will actively maintain follow-up contacts at 3 months and 1 year to document survival outcomes. Concurrently, trapped offending dogs will undergo molecular verification via reverse transcription polymerase chain reaction (RT-PCR) and next-generation sequencing (NGS) to map localized viral ecology, providing crucial real-world data to optimize outbreak emergency response frameworks.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Target follow-up
- 1 Year
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Grade III rabies exposure cohort | – | Drug: Zamerovimab and Mazorelvimab Injection plus Rabies VaccineAdults (≥18 years) who sustained verified WHO Grade III rabies exposure from a traceable dog involved in a tracked multi-person attack incident, and who initiated standardized PEP within the protocolized window. |
Who may qualify
- Ages
- 18 to 99 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- People aged 18 or older who were bitten by a dog that also bit others, have a serious (Grade III) rabies exposure, and already received wound cleaning, the antibody injection, and the first rabies shot within 24 hours can join.
Key inclusion criteria (6 listed)
- Adults aged ≥18 years at the time of screening.
- Sustained a verified WHO Grade III rabies exposure from a traceable offending dog involved in a multi-person canine attack incident (defined as a single animal attacking multiple individuals within a clustered timeframe/location) in Nanyang City.
- Time interval from Grade III exposure to post-exposure prophylaxis (PEP) initiation is less than 7 days.
- Successfully completed standard wound debridement, anatomical infiltration of zamerovimab/mazorelvimab injection (0.3 mg/kg single full dose), and the first dose of rabies vaccine within 24 hours prior to screening.
- Voluntarily provides signed written informed consent.
Key exclusion criteria (4 listed)
- Documented history of any separate animal bite or scratch (e.g., dog, cat, bat, or wild carnivore) within the past 12 months prior to the current exposure.
- Documented complete pre-exposure or post-exposure rabies vaccination history within the past 12 months.
- Concurrent presentation with life-threatening traumatic injuries requiring intensive care, or severe systemic immunodeficiency disorders that could impede immunogenicity or follow-up compliance.
- Any other clinical or psychological condition deemed by the investigator as unsuitable for safe participation or reliable data registry.
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 |
|---|---|---|
| Zamerovimab and Mazorelvimab Injection plus Rabies VaccineStandard-of-care wound debridement, followed by anatomical infiltration of zamerovimab/mazorelvimab injection at a single dose of 0.3 mg/kg around the wound sites on Day 0, combined with a standard intramuscular rabies vaccine regimen. | Drug | Grade III rabies exposure cohort |
Primary outcome
3-month rabies-free survival rate
Time frame: 90 days (±3 days) post-enrollment
The proportion of participants alive and free of clinical rabies symptoms at 90 days following post-exposure prophylaxis (PEP) initiation.
1 secondary outcome
1-year rabies-free survival rate
Time frame: 365 days (±7 days) post-enrollment
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 11 Jun 2026.
- Individual participant dataSharing planned: No
Related trials for Rabies Post-exposure Prophylaxis
RecruitingObservational study
Real World Evidence Study of SYN023 in Children Exposed to Rabies
Rabies Post-exposure Prophylaxis
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. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Rabies Post-exposure Prophylaxis and Rabies, run by Synermore Biologics (Suzhou) Co., Ltd. at 1 site 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 6 inclusion and 4 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: under way, not looking for participants, as of the sponsor's last update on 11 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site 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. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
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?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
3-month rabies-free survival rate (time frame: 90 days (±3 days) post-enrollment). 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 11 Jun 2026.