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Studies have shown a reduction in the efficacy of vaccines with newer variants. As the world moves towards boosters doses, the efficacy of the COVID vaccines is becoming a concern. According to researchers from the University of Oxford, UK, and the country’s Office for National Statistics, Pfizer/BioNTechCOVID-19 vaccine efficacy fell to 90 per cent, 85 per cent, and 78 per cent after 30, 60, and 90 days, respectively, and AstraZeneca vaccine efficacy dropped to 61 per cent by 90 days with the Delta variant. There are ongoing studies for booster doses but certain governments and vaccine manufactures have advocated for booster doses. Booster doses can become a burden for nations when some are struggling to obtain vaccines for first and second doses.

United statesUnited kingdomCyrus poonawallaPriya abrahamZydus cadila zycoSoumya swaminathanTedros adhanom ghebreyesusPrabhat prakashWinnie byanyimaNarendra modiAdar poonawallaKiran majumdar shawAnna marriottSerum institute life sciencesBiocon biologics ltdNational institute of virology