WASHINGTON, United States (AFP) — Drugmakers Pfizer and BioNTech announced Tuesday they have formally submitted a request asking US officials for emergency authorization of their Covid-19 booster vaccine for people aged 18 and older. The move follows research published by the companies in late October indicating a third shot is 95.6 percent effective against symptomatic infection, based on clinical trials carried out on 10,000 people. The companies asked the US Food and Drug Administration to […]