Two doses of COVID-19 vaccine administered to mothers during pregnancy were 95% effective against infection with the SARS-CoV-2 Delta variant and 97% effective against related hospitalizations among infants younger than 6 months, according to a study of 8809 infants in The BMJ. Protection was lower against infection with the Omicron variant and corresponding hospitalizations, although a third dose boosted the effectiveness to 73% against infection and 80% against hospital admission.
Source: JAMA Online First