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Does exposure to less than the Minimum Infective Dose act as a vaccine in some cases?

I know that there’s no immune response/adaptation of some (relatively) new viruses like HIV for which it’s estimated that it would take at least 32,000 years for humans to develop a non-pathogenic response similar to that that some monkeys have to SIV. But for more “run of the mill” viruses like new strains of influenza […]