Many Americans have heard about cholera only from “The Oregon Trail,” the retro computer game in which players try to get their 1830s pioneers to the Oregon Territory. If your wagon train comes down with this highly contagious bacterial infection, the pioneers could die from diarrhea and dehydration before they get out of Nebraska.
In the 21st century, the U.S. records fewer than 20 cholera cases per year, nearly all of them in travelers who were infected abroad.
