Lettuce served at Taco Bell in five Midwestern states, supplied by Taylor Farms, has been linked to an outbreak of cyclospora, a parasite that causes diarrhea.

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

Taco Bell’s business has taken a major hit after lettuce served at the chain was linked to the cyclospora outbreak. To win back wary customers, the company is now offering…