A trio of new real-world US studies examine the ongoing effectiveness of two doses of the Pfizer/BioNTech and Moderna mRNA vaccines against COVID-19, one finding significantly ebbing efficacy against infection in nursing home residents and two showing sustained protection against coronavirus-related hospitalizations but declining coverage against new adult cases.The studies were cited today as White House officials announced plans to offer booster doses of the vaccines beginning next month (see related CIDRAP News story).
They were published today in Morbidity and Mortality Weekly Report, the journal of the Centers for Disease Control and Prevention (CDC).The results, the study authors said, underscore the need for heightened vigilance and