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: 2019-nCoV vaccine mRNA-1273; BNT162 vaccine; COVID-19; ChAdOx1 nCoV-19; MVC-COV1901 vaccine; SARS; SARS-CoV-2; Taiwan; coronavirus; coronavirus disease; healthcare personnel; influenza; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.