There is no such test. Immunity is not a yes/no concept. You can have very strong immunity and still die frim COVID due to cytokine storm. You can have a weak immunity and survive due to your body not responding to the virus, and it automatically died out. You can have a weak immunity and die because the virus proliferated very quickly.

Hi,zinc,vit.c,&bit d boost up your immunity.grren leafy vegetables,eggs are useful.no tests available..

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Sorry there is no such single test.

No