Vaccines Against #COVID19 That Were Developed by US Drug Makers #Pfizer and #Moderna May ... - Latest Tweet by IANS Tweets

Vaccines against #COVID19 that were developed by US drug makers #Pfizer and #Moderna may not be as effective against the '#Delta' variant compared to as they were against the original strain of the virus, suggests a new study. pic.twitter.com/WMxhsAFAGB— IANS Tweets (@ians_india) August 12, 2021

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