Ah, man, I feel for those hikers. The summer that I worked at Philmont Scout Ranch as a ranger we had an outbreak of "Urraca plague", which was almost certainly norovirus. I was working with a scout ...

gosh, in my day backpacking in the Sierras we drank from the streams, no one had filters or iodine, we'd never heard of Giardia. fast forward to late 1980s, giardia is everywhere, filter everything, ...