Pfizer says new Covid booster works better against omicron strains than old one in study
By Robert Langreth | Bloomberg Pfizer Inc.’s bivalent vaccine bolstered protective antibodies against the dominant...
California throws more money at COVID-19 contact tracing, but is it too late?
(Photo by iStock/Getty Images) Intensive contact tracing has helped contain COVID-19 outbreaks in some Asian...