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Herd immunity by natural infection very difficult, says AIIMS Director Gul
Updated : 4 years, 8 months ago IST
Kolkata (West Bengal) [India], February 24 (ANI): Sero surveillance data has shown that only around 20 to 25 per cent of individuals across the country have positive antibodies, so herd immunity by natural infection is very difficult to achieve, according to All India Institute of Medical Sc
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