Those days of un-hygienic mass migrations to the Hereafter are, hopefully, over. But poor food handling techniques, unclean food handlers and improper sanitation cost about eight billion U.S. dollars annually in medical bills and lost wages. And germs spoil many a wilderness experience. A little science tempered with a dose of common sense can eliminate most of the risks. And, after the deed, wash your hands.
Latrines are out, except in established spots.
They concentrate too much poop in one place. They carry a high risk of water pollution. They invite insect and mammal investigation. They are unsightly, and they stink. If you are ever required to dig a latrine, make it at least a foot deep and add soil after each deposit, and fill it in when the total excreta lies several inches below the surface.