And yet as a young NAVY man I wandered the streets of Tijuana/Ensenada MX, Olongapo PI, Kaohsiung Taiwan, Hong Kong eating BBQ from street vendors (some kind of meat grilled over an open fire), drinking Mai Tai that was made in a bucket, having meals with the locals (whatever they were offering), shopping for fish, chickens, pig in open air 'markets' and drinking water from hoses.
I never got sick.......
6 yrs later back in the States out on a date at a fancy steak house I get the worst food poisoning
Haven't been sick since....not food poisoning, colds or flu.