I am sure the sanitation, or lack thereof, has a lot to do with spreading viruses as well. I had read of the bathroom facilities before my first visit but was amazed at how primative they seem to be in all but the most North Americanized places. Just toss the TP in the trash, good luck finding hot water to wash your hands and forget about clean towels with which to dry them.
One day my "novia por la semana" asked to stop at la farmacia to pick up some medicine for her niños. Seems they both had a case of "intestinal parasites". I'm not sure what the hell that is, but thankfully as fas as I know I didn't bring any home with me.
