testing to ensure that you can't get reinfected by a virus you have antibodies for is not "being cautious".

it is foolishly reinventing the wheel - and either driven by ignorance or stupidity.

perhaps it is true that we don't have studies to back the claim up directly, but this is a situation where this is such basic science that it isn't necessary. we know that. it's not a high risk deduction.

what we need to be concerned about is if the virus is mutating or not, not whether or not we can be "reinfected", which is an incoherent concept.