Booster dose of six Covid vaccines safe, increases immunity: Lancet study

Six different COVID-19 boosters are safe and elicit strong immune response in people who have previously received a two-dose course of AstraZeneca or Pfizer vaccines, according to a study published in The Lancet journal. Two doses of AstraZeneca and Pfizer vaccines have shown 79 per cent and 90 per cent protection, respectively, against hospitalisation and death after six months in several studies, the researchers said.