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Well, for one thing, if people can be tested to confirm they had and recovered from the virus and therefore have some immunity to it, those people can more safely assist people who are currently ill and move about more freely in society (unless they are still at risk to transmit the virus to others, of course).

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You cannot assume that recovering from the virus confers immunity, especially when "the virus" is already "two strains of virus" (and will almost definitely end up mutating more before this is over).

FWIW the 'two strains' theory was debunked.

It certainly confers immunity for a short period of time. How long that immunity lasts for is unknown, but it’s not unreasonable to start with an assumption of “at least a few months”.

There’s also not strong evidence that there are two sufficiently different strains. Viruses experience small, mostly meaningless, mutations with great frequency. The research talking about S and L types are actually just an arbitrary categorization of many different mutations of the virus.

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