Cohort Study to Measure COVID-19 Vaccine Effectiveness Among Health Workers in Georgia

Many critical questions remain about the effectiveness of COVID-19 vaccines in real-world settings. These questions can only be answered in post-introduction vaccine effectiveness studies.

This is a prospective one-year cohort study of hospital-based health workers in Georgia to evaluate the effectiveness of COVID-19 vaccine in preventing laboratory-confirmed SARS-CoV-2 infection and COVID-19 disease. Health Workers (HWs) are the target population in this study because they have been prioritized to be the first group to receive the vaccine in Georgia and offer an early opportunity to evaluate the vaccine in a population in which it is critical that an effective vaccine be deployed.

HWs should be enrolled after the study protocol is approved by the local ethical review committee. All HWs eligible to be vaccinated with COVID-19 vaccine can be enrolled in the study, including those who intend to get vaccinated, those who do not plan on getting vaccinated, and those who are not sure. For HWs who have already been vaccinated at enrolment, priority will be given to those who have received their first COVID vaccine no more than 4 days prior to the date of enrolment. The target enrolment is 1600 participants.

At enrolment, study participants will complete a baseline enrolment survey about demographics, clinical comorbidities, and work and community-related behaviors related to infection risk, and recent symptoms. In addition, a baseline serology will be collected from participants at enrolment.

For study participants who have not received their first COVID-19 vaccine at enrolment but receive their first vaccine 14 days or more after enrolment, an additional blood sample will be collected. In addition, a brief symptom questionnaire about recent symptoms will be administered.