Many different kinds of food born pathogens. Listeria, fecal cloriforms, ecolli etc we do build up an immunity to the local ‘flora’ and getting “Moctazuma’s revenge” is what happens when you travel to areas with a different version of fecal cloriforms in the water (and apparently it works both ways too)
But like with deaths from covid, food poisoning hits the elderly and infants harder.
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