if there's 11 different strains, do you need 11 different vaccines?

not necessarily. but, the vaccine would need to account for all 11 strains to actually be halfways effective - as well as continually evolving strains.

it would, however, mean that you could potentially catch it 11 different times - and that antibody tests likely only test for one or maybe a few strains.

do you see the futility of what we're doing, yet?