Pfizer says COVID booster offers protection against omicron
PHILADELPHIA (WPVI) -- Pfizer said Wednesday that a booster dose of its COVID-19 vaccine may protect against the new omicron variant even though the initial two doses appear signif…
PHILADELPHIA (WPVI) -- Pfizer said Wednesday that a booster dose of its COVID-19 vaccine may protect against the new omicron variant even though the initial two doses appear signif…