How long will it take to acquire Herd Immunity with lock down?

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Herd immunity with vaccination and such a large population with maximum malnutrition and anaemia particularly in fair sex is beyond thinking. Miracles do happen, hope for the best at earliest.
Thanks Dr Vipin Bihari Jain
The time to discuss herd immunity is when we have a vaccine developed,and not one second earlier,, because at that point we'll be able to really stop the pandemic in its track

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