Patch guards against Montezuma’s revenge

From Philadelphia, at a meeting of the American Society of Tropical Medicine and Hygiene

A skin patch can prime the immune system to fend off traveler’s diarrhea, a test shows.

Bacteria that contaminate food and water in developing countries cause roughly 17 million cases of diarrhea each year, many in visitors to those countries. To test a vaccine against a strain of Escherichia coli responsible for a large fraction of these bouts, researchers enlisted U.S.