A booster dose of an inactivated SARS-CoV-2 vaccine targeting virus variants sustains protective humoral and cellular immunity.

ABSTRACT:

Background

The Omicron lineage of SARS-CoV-2 showed a remarkable ability to escape vaccine-induced immunity. In a Phase 2 clinical trial, we investigated whether a third booster/fifth dose of one of three inactivated SARS-CoV-2 vaccine candidates, based on the Delta and Omicron BA.1 variants, enhanced humoral and cellular immune responses against SARS-CoV-2.

Methods

Volunteers who received either four doses of CoronaVac® (homologous group, n = 228) or two doses of CoronaVac® followed by two mRNA vaccine doses (heterologous group, n = 298) were randomly assigned to receive an Omicron BA.1-based, trivalent (ancestral, Delta, Omicron BA.1) inactivated vaccine or an additional dose of CoronaVac® (heterologous group only). Local and systemic adverse events were recorded for 7 day

SUBMITTER: Mendez C 

PROVIDER: S-EPMC12822000 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature