Rapid Viral Diagnostics in Adults to Reduce Antimicrobial Consumption and Duration of Hospitalization

Aim and Hypothesis

The aim of the study is:

1. To find out how the modern rapid multiplex-PCR based respiratory virus detection method affects the patient care
2. To examine does it shorten the length of admission and reduce antibiotic consumption
3. Compare the seasonality of different viruses in children and adults
4. Investigate the development and progress of an epidemic
5. Study the differences in the prevalence and severity of infections between genders
6. Describe clinical manifestations of different viral infections in adults
7. View more closely certain subgroups such as patients with chest pain in respect to different viral epidemics and their effect on the hospital admission rates
8. Evaluate the information provided by the bacterial detection

Subjects Our hospital is both a regional and a university hospital at the same time. Patients come to our clinic from a quite large area surrounding the city of Oulu and they represent the general population of the area well. The study population will be recruited 2014-2015 in the emergency clinics for pediatric and internal medicine patients in the Oulu University Hospital. Participants are patients with respiratory infection symptoms, chest pain or fever. Fever is determined as body temperature of 38 degrees centigrade or more measured either in the hospital or at home.

Study design This is a randomized clinical trial evaluating the impact of modern multiplex PCR based respiratory virus diagnostics on treatment and outcome of adult patients. Participants are randomized in two groups with results being reported either immediately or after a week (Picture 1). In children the viral PCR diagnostics is already routinely used and collection of nasal and pharyngeal samples continues normally. All pediatric results are reported immediately. Approval of the ethical review board of the Northern Ostrobothnia Hospital District has been acquired.

Course of the study Data collection All patients entering the internal medicine emergency clinics because of respiratory infection symptoms (cough, rhinitis, shortness of breath, sore throat), chest pain or fever will be given the opportunity to participate in the study. After signing an informed consent a nasal and a pharyngeal swab will be taken for viral examination. Adult patients are randomized in two different groups. In one group the results of the viral detection are reported immediately and in the other group they are reported 7 days after sampling.

Samples will be analyzed in the microbiological laboratory by real time PCR method Anyplex TMII to detect genome of 16 different respiratory viruses and of 5 different bacterial pathogen (Table 1). Results in the delayed group will be given earlier in the case the clinician is requesting them. The results of the bacterial findings will be analyzed after completion of the study since the clinical relevance of them is not clear yet. The bacteriological diagnostic of the patients during the study relies on the routinely used methods.

The attending clinician decides the treatment and care of the patient independently. Patient's chart will be reviewed for the course of disease, antibiotic use, ICU care and length of hospital stay. The results of key laboratory tests and microbiological findings will be collected. Radiological findings will be registered. At discharge, the participants are asked to report the duration of the symptoms, absence from work and the date of a possible doctors follow up. The population register centre will be used at the end of the study to find out the number of deceased, and their time and cause of the death will be recorded

. Table 1. Microbes detected from the study samples Viruses (AnyplexTMII RV16 Detection) Adenovirus Influenza A/B virus Parainfluenza virus1/2/3/4 Rhinovirus A/B/C Respiratory syncytial virus A/B Bocavirus 1/2/3/4 Metapneumovirus Coronavirus 229E/NL63/OC43 Enterovirus

Data analysis The length of hospital admission and the use of bacterial antibiotics is compared between the randomized groups. Viral findings of children and adults will be evaluated. The emergence of viruses in different areas of the district as well as in different age groups is examined. The differences in clinical picture and in microbiological findings between genders are viewed. The symptoms and clinical findings in adults with detected RSV or metapneumovirus are described. The bacterial findings are evaluated and compared with clinical data to determine the significance of the information provided by the test.

Impact of the study In our hospital major part of the viral respiratory infection diagnostics in adults has been accomplished by influenza virus antigen detection. Now a more sensitive measure for detecting 16 different respiratory pathogens from nasopharyngeal sample is available. We will determine whether more specific identification of the etiological agent affects the patient care. If the accurate diagnostics diminishes inappropriate antibiotic use it saves the patient from potential side effects and the society from unnecessary costs. Importantly it also saves the microbial flora from the antibiotic selection pressure which is considered to facilitate the emergence of antibiotic resistance. In children the benefits of accurate diagnostics have been recognized but in adults this is still under progress. This study is designed to demonstrate these advantages in adults.