Up to six different Covid-19 boosters were found to be safe, and provoked strong immune responses in people who have previously received a two-dose course of the Oxford-AstraZeneca-developed Covishield, or Pfizer-BioNTech’s BNT162b2, the first randomised phase 2 trial of boosters given after two doses of either vaccine, published in The Lancet shows.source https://timesofindia.indiatimes.com/india/covid-19-a-wide-range-of-vaccines-act-as-booster-to-astrazeneca-pfizer-shots-says-study/articleshow/88059696.cms
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