Americans are making fewer visits to food chains with lettuce-heavy menus as concerns mount over the cyclospora outbreak.

US health officials linked iceberg lettuce served at Taco Bell to an outbreak of the parasite cyclospora, which causes “explosive” diarrhea. Health officials warn that the…

A record number of cyclospora cases have been reported in more than 30 US states, but experts say not every illness is likely to have been caused by a single source.

Taco Bell has removed shredded iceberg lettuce from its restaurants after US health authorities linked the ingredient to a multistate outbreak of cyclospora, a parasitic infection…