Homologous and Heterologous Covid-19 Booster Vaccinations

摘要

Background:Although the three vaccines against coronavirus disease 2019(Covid-19)that have received emergency use authorization in the United States are highly effective,breakthrough infections are occurring.Data are needed on the serial use of homologous boosters(same as the primary vaccine)and heterologous boosters(different from the primary vaccine)in fully vaccinated recipients.