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1923. Outcomes of the adsorbed Sinovac CoronaVac COVID-19 inactivated vaccine among the employee recipients in St. Luke’s Medical Center Quezon City: an observational cohort study
Abstract Background Of the nine COVID-19 vaccines, the inactivated vaccine named CoronaVac, containing HB02 strain of SARS-CoV-2 created from Vero cells, created by the manufacturing company Sinovac was the first vaccine to arrive and be distributed in the Philippines, primarily in the private and g...
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| Published in: | Open forum infectious diseases 2022-12, Vol.9 (Supplement_2) |
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| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Abstract
Background
Of the nine COVID-19 vaccines, the inactivated vaccine named CoronaVac, containing HB02 strain of SARS-CoV-2 created from Vero cells, created by the manufacturing company Sinovac was the first vaccine to arrive and be distributed in the Philippines, primarily in the private and government hospitals in Metro Manila. It is therefore important to determine the vaccine’s effectiveness and safety among its recipients, including the frontline healthcare workers (HCWs).
Methods
This was an observational cohort study which included HCWs from a tertiary hospital who have received one and/or two doses of CoronaVac from March 2021. The primary outcome of the study was to determine the clinical effectiveness of the vaccine in reducing risk of COVID-19 infection. The secondary outcome was the safety endpoint of the study vaccine.
Results
Out of the 2954 CoronaVac vaccinees, a total of 368 HCWs have been infected with SARS-CoV-2. 146 (4.94%) recipients have been infected with COVID-19 after receiving their first dose, while 222 (7.51%) tested positive after the second dose. 179 recipients reported of adverse reactions following immunization, with majority of these HCWs experiencing minor symptoms. The relative risk for COVID-19 infection among those given was at 15.7%, indicating the clinical effectiveness of the said vaccine. Receiving CoronaVac vaccine will reduce the risk of COVID-19 infection by 84.3%. Table 3.Percentage of infected HCWs in SLMC-QC post-vaccination of CoronaVac
Out of the 2954 CoronaVac vaccinees from SLMC, a total of 368 HCWs have been infected with SARS-CoV-2 after receiving either their first or second dose of CoronaVac vaccine from March to December 2021. 146 (4.94%) recipients have been infected with COVID-19 after receiving their first dose, while 222 (7.51%) participants tested positive for SARS-CoV-2 after completing two doses of the inactivated vaccine (Table 3).
Meanwhile, during the observation period after the 2nd dose of the vaccine, there were more reported cases of COVID-19. From a total of 222 (60.6%) COVID-19 confirmed cases after receiving their second dose of Sinovac, 33 were asymptomatic, while 176 recipients acquired mild infection and 12 participants had moderate COVID-19 infection. There was one case of severe COVID-19 and no cases of critical COVID-19 after completion of 2 doses among the HCWs (Figure 1).
Based on this information, the researchers have computed for the relative risk (RR) for acquiring COVI |
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| ISSN: | 2328-8957 2328-8957 |
| DOI: | 10.1093/ofid/ofac492.1550 |