Vibriosis, a seasonal summer infection, can be severe. Vibrio bacteria thrive at popular bathing sites like the Baltic Sea. Here's how to protect yourself.

Health officials say a flesh-eating bacteria has already killed four people in Florida this year. The bacteria, called Vibrio vulnificus, prompted a warning from the Florida Department of Health.

Open water competition at the World Swimming Championships went off Wednesday after two postponements because of water-quality ...