அது என்ன Herd Immunity? கொரோனாவை கட்டுபடுத்த இது பயன்படுமா?

2020-05-04 14 Dailymotion

அது என்ன Herd Immunity? கொரோனாவை கட்டுபடுத்த இது பயன்படுமா?

Will herd immunity be a cure to covid-19?

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