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Really? Well then what's the point in any of this... if antibodies don't last long and that people who have had it before can still get infected?
If we are always going to get reinfected when (re)exposed within a few months or less, why develop or wait on a vaccine? A vaccine is a substance used to stimulate the production of antibodies and provide immunity, isn't it?
Like I said, I am past the mask argument... It's dumb. I heard experts say at the beginning they do more harm than good... Then they say, you have to wear them to save lives... Then they say masks only help those that have it from spreading, but don't stop you from getting it... Whatever.... I'd wear one even if it did nothing but stop people from talking about masks.
Still lots of unknowns. It's been reported for a couple of months now that recovered COVID-19 patients' antibodies seem to decrease with time. We don't know what that means as far as re-infection (there have been a couple of reports of a recovered patient being diagnosed again at a later date, but it's unclear if that's because they never fully recovered or if it's a true re-infection). Further, we don't know how anti-bodies from a vaccine will behave. It could be like the flu vaccine where we have to get it every year. Or it could be like a tetanus shot where you get one every couple of years, or it could be like polio where you only get it once.
So, in areas where there are unknowns, precautions are low cost, and severity is high, it's prudent to continue the low cost prevention. Because we aren't at a point where we can monitor people who have sufficient anti-bodies to prevent infection and spread, it would be really high cost to create a system where those people can walk around without masks and while everyone wears a mask, it's far more efficient to just have everyone wear a mask. Low cost, decent rewards.
I understand you aren't arguing against wearing a mask... just point out a reason why even previously infected people should continue to wear one.