Cholera (aka diarrhea)? How can you use a virus/bacteria in an argument that we don't even vaccinate against in North America lol... "The cholera bacterium is usually found in water or food sources that have been contaminated by feces (poop) from a person infected with cholera. Cholera is most likely to be found and spread in places with inadequate water treatment, poor sanitation, and inadequate hygiene." "The disease is not likely to spread directly from one person to another; therefore, casual contact with an infected person is not a risk for becoming ill."  -CDC

"In the U.S., cholera was prevalent in the 1800s but water-related spread has been eliminated by modern water and sewage treatment systems."

Wait a minute so Cholera is spread EXACTLY the same way Polio is spread but modern water and sewage treatment is credited for the eradication of Cholera but not polio?