Risky Trips: Culinary adventures in Mexico, Central and South America, as these locations are responsible for around 85 percent of tourist-related cases. According to the CDC, this is one of the most common vaccine-preventable infections picked up during travel. (A note to surfers: "San Diego's Imperial Beach has some of the most polluted waves in America," says Richard Gersberg, professor of Environmental Health at San Diego State University. "Particularly, after it rains, mostly because of the runoff from the Tijuana River.")
Vital Signs: Because exposure to contaminated water, shellfish, or produce can land you in a hospital, double check that the chefs work in sanitary conditions before chomping on that shrimp ceviche or fruit salad. If you don’t...symptoms could start showing up in 15 to 50 days. “Tell-tale signs that you’re infected are abdominal pain and yellowing of the skin and eyes,” says Adalja. Your best bet for staying healthy is to flex that deltoid and get a vaccine.