Pfizer/BioNTech Covid vaccine less effective in ages 5-11 : New York study

Two doses of the Pfizer Inc and BioNTech SE Covid-19 vaccine was protective against severe disease in children aged 5 to 11 during the recent Omicron variant surge, but quickly lost most of its ability to prevent infection in the age group, according to a study by New York State researchers.

The vaccine's efficacy against infection among those children declined to 12 percent at the end of January from...