New Delhi, Feb 13 Mathematical calculations indicate that Covaxin may provide immunity against Covid-19 for 9 to 12 months, and there may be a booster shot after this period elapses, Y.K. Gupta, the President of AIIMS Bhopal and Jammu, told .
Stressing on the safety and effectiveness of Covaxin, Gupta, former Dean
( With inputs from IANS )
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