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Originally Posted by Adder
Right and also why trick or treating isn’t “safe” despite a single outdoor brief exchange at the door being “safe.” Everything has risk and each risk is cumulative.
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Incremental introduction does not build up viral load over time. If the viral load of one exposure is too low to cause issue, a subsequent low viral load is not stacked on the prior one to create adequate load for reaction.
If I go to the store every day, my cumulative risk of getting hit with a significant dose increases. But it's an outlier -- the possibility a person with it sneezes on me. My repeat visits from day to day do not create an adequate viral load for infection because I am incrementally adding little amounts of virus day to day.
OTOH, massive viral load from significant repeat exposures such as those which killed HC professionals early on in the pandemic do stack. But only because they came in enormous doses quickly over short periods of time.
