Estimated COVID-19 mRNA vaccine effectiveness, illness severity during Omicron BA.4 and BA.5 periods
About The Study: In this case-control study of COVID-19 vaccines and illness, vaccine effectiveness associated with protection against medically attended COVID-19 illness was lower with increasing time since last dose; estimated vaccine effectiveness was higher after receipt of one or two booster doses compared with a primary series alone.
Authors: Ruth Link-Gelles, Ph.D., M.P.H., of the Centers for Disease Control and Prevention COVID-19 Response Team in Atlanta, is the corresponding ...





