Effectiveness of the Adsorbed Vaccine COVID-19 (Coronavac) Among Education and Public Safety Workers With Risk Factors for Severity

Study Overview
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Brief Summary
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This is a quasi-experimental study with risk-based allocation. Public security and education professionals from the state government will be included. In the initial evaluation, the presence of comorbidities associated with an increased risk of serious disease due to COVID-19 will be evaluated, according to the national plan for the implementation of vaccination against COVID-19. Those with at least one of these comorbidities will be invited to receive the study vaccine in two doses, with an interval of 28 days (±7 days). Participants with low risk (without comorbidities as a risk factor for severe COVID-19 according to the national plan for the implementation of vaccination against COVID-19) will not receive the vaccine within the scope of the research project. If, after 12 months, the participant in the low-risk group (no vaccine) has not received CoronaVac, or any other vaccine available, he/she will receive the vaccine, exactly as offered in the other group (two doses of CoronaVac with an interval of 28 days - with a tolerance of 7 days before or after). All participants will be followed up for 12 months from inclusion in the study. Immunization is expected to reduce the risk of moderate to severe disease of those with comorbidities to the level of those of the same age group who do not have these comorbidities but face similar occupational risks.

Official Title
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Phase IV Study to Evaluate the Effectiveness of the Inactivated Adsorbed Vaccine Against COVID-19 CoronaVac, Among Public Safety and Education Workers With Risk Factors for Severity, in Manaus (Amazonas)

Conditions
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Covid19

Intervention / Treatment
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* Biological: Adsorbed SARS-CoV-2 (inactivated) vaccine


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age between 18 and 49 years Demonstrate availability to be accompanied during the follow-up time defined in the study, through visits, telephone contacts, or other means of digital communication. Exclusion Criteria: Prior vaccination for COVID-19; Diagnosis of COVID-19 in the last 28 days (nasal and oropharyngeal swab); History of severe allergic reaction or anaphylaxis to study vaccine components; Report of fever in the 72 hours prior to vaccination (the inclusion may be postponed until the participant completes 72 hours without fever); Possible or confirmed of COVID-19 on the day of vaccination (in this situation, vaccination can be postponed until the participant completes 72 hours without symptoms or the diagnosis is ruled out); Have received live attenuated virus vaccine in the last 28 days or inactivated vaccine in the last 14 days prior to inclusion in the study, or have immunization scheduled for the first 28 days after their inclusion in the study; Any other condition that, in the opinion of the principal investigator or his medical representative, could endanger the safety or rights of a potential participant or that would prevent him or her from complying with this protocol; Pregnancy or breastfeeding.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 49 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Quasi-experimental study
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: High-risk individuals (with comorbidities)<br>Public safety and security (police officers and law enforcement, fire department), and high school and college/university professionals of the state government public education network who present at least one of the comorbidities included in the National Plan for the Operationalization of Vaccination Against COVID-19 will be invited to receive the CoronaVac vaccine | Biological: Adsorbed SARS-CoV-2 (inactivated) vaccine<br>* 600 SU/dose; Two doses separated by 28 days (± 7 days). Intramuscular (deltoid) administration.<br>* Other names: CoronaVac;|
| No Intervention: Low-risk individuals (without comorbidities)<br>Participants with low risk (without comorbidities as a risk factor for severe COVID-19 according to the national plan for the implementation of vaccination against COVID-19) will not receive the vaccine within the scope of the research project. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence density of moderate and severe clinical cases of COVID-19 | Incidence density of moderate and severe clinical cases of COVID-19 (Grade 4 or higher according to the WHO clinical progression scale), after the second week after the second dose of the vaccine. | 2 weeks after the second vaccine dose | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence density of moderate and severe clinical cases of COVID-19 after first dose | Incidence density of moderate and severe clinical cases of COVID-19 (grade 4 or higher according to the WHO clinical progression scale) from the first dose | After first dose, up to 12 months. | 
| Incidence density of moderate and severe clinical cases of COVID-19 after second dose | Incidence density of moderate and severe clinical cases of COVID-19 (grade 4 or higher according to the WHO clinical progression scale) from the second dose | After second dose, up to 12 months. | 
| Incidence density of severe clinical cases of COVID-19 after second dose | Incidence density of severe clinical cases of COVID-19 (grade 6 or higher according to the WHO clinical progression scale) from the second dose | After second dose, up to 12 months. | 
| Median of clinical progression scores between moderate and severe cases | Comparison of the median clinical progression scores according to the WHO clinical progression scale between groups | After first dose, up to 12 months. | 
| Incidence density of clinical cases virologically confirmed as COVID-19 |  | After first dose, up to 12 months. | 
| Mortality confirmed as COVID-19 | Incidence density of deaths confirmed as COVID-19 | After first dose, up to 12 months. | 
| Incidence density of hospitalizations for any cause |  | After first dose, up to 12 months. | 
| Mortality from any cause | Density of mortality from any cause | After first dose, up to 12 months. | 
| Adverse events | Frequency of adverse events associated with the need for medical care | Up to 7 days after each dose of the vaccine (Day 7 and Day 35) | 
| Humoral and cell-mediated immune response | Quantification of humoral and cell-mediated immune response to vaccination in samples of a subgroup of participants | Before each vaccine dose and every 3 months, up to 12 months of follow-up. | 
| Detection of antibodies against SARS-CoV-2 in samples |  | Before each vaccine dose and every 3 months, up to 12 months of follow-up | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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SARS-CoV-2, Brazil, Covid-19, Vaccine, Sinovac, CoronaVac, Vaccine efficacy