Pharma company Pfizer said on Wednesday that studies of its COVID-19 vaccine indicate that a booster dose offers protection against the Omicron coronavirus variant. The company said researchers found that the level of neutralizing antibodies increased 25-fold in people who'd received a third dose of the vaccine, which it developed with BioNTech. Booster Covid jabs promising against Omicron variant, Pfizer and BioNTech say https://t.co/uUPBzgpBo0 — BBC News (World) (@BBCWorld) December ...