what i ain't figured out, but afterall i'm a lowly tax-payiing commoner, is how long is the virus vaccine effective? if, and i say if, one is resistant to re-infection from the actual covid (well, one of them) for only 90 days how long is the vaccine effective? i took my two modernas and am wondering if i might need a third for more effectiveness. as an aside my stiff ankle has loosened up quite a bit after the two modernas. of course the physical therapy might have helped too.