WASHINGTON, D.C., United States (AFP) – Pfizer and BioNTech announced Tuesday they had formally asked the United States drug regulator for emergency approval of a second booster shot of their Covid vaccine for people aged 65 and older. The companies said in a press statement that their request is based off two Israeli studies that show “an additional mRNA booster increases immunogenicity and lowers rates of confirmed infections and severe illness.” Most countries’ case-levels have […]