SARS-CoV-2 Reinfection Rate and Estimated Effectiveness of the Inactivated Whole Virion Vaccine BBV152 Against Reinfection Among Health Care Workers in New Delhi, India.

ABSTRACT:

Importance

A surge of COVID-19 occurred from March to June 2021, in New Delhi, India, linked to the B.1.617.2 (Delta) variant of SARS-CoV-2. COVID-19 vaccines were rolled out for health care workers (HCWs) starting in January 2021.

Objective

To assess the incidence density of reinfection among a cohort of HCWs and estimate the effectiveness of the inactivated whole virion vaccine BBV152 against reinfection.

Design, setting, and participants

This was a retrospective cohort study among HCWs working at a tertiary care center in New Delhi, India.

Exposures

Vaccination with 0, 1, or 2 doses of BBV152.

Main outcomes and measures

The HCWs were categorized as fully vaccinated (with 2 doses and ≥15 days after the second dose), partially vaccinated (with 1 dose or

SUBMITTER: Malhotra S 

PROVIDER: S-EPMC8742193 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature