Effectiveness of Booster and Influenza Vaccines against COVID-19 among Healthcare Workers, Taiwan

Abstract

Among previously uninfected healthcare workers in Taiwan, mRNA COVID-19 booster vaccine was associated with lower odds of COVID-19 after primary recombinant vaccine. Symptom-triggered testing revealed that tetravalent influenza vaccine was associated with higher odds of SARS-CoV-2 infection. COVID-19 vaccination continues to be most effective against SARS-CoV-2.

Keywords

• COVID-19
• respiratory infections
• influenza
• severe acute respiratory syndrome coronavirus 2
• SARS-CoV-2
• SARS