Alice Callahan

As the largest cyclospora outbreak in U.S. history wanes, experts weigh in on whether iceberg and other fresh produce are still a risk.

A proposed rule would require companies to notify the agency about ingredients they plan to add, but companies would still be able to self-police their safety.

Illinois, Kansas, Oklahoma and Pennsylvania now join Michigan, Ohio, Indiana, Kentucky and West Virginia in cyclospora outbreak linked to iceberg lettuce.

Health officials did not identify the location of the outbreak, or what they believed was causing it.

Federal health officials have confirmed another 2,500 cases of the parasitic infection.

The large number of cases suggests that excrement entered the food system on a “surprising scale.”

The F.D.A. said it was continuing to look into the supplier as a big player in the outbreak.

Federal officials worked with Michigan investigators to trace the outbreak to iceberg lettuce, which may also have gone to other vendors.

The parasite has sickened thousands across the United States. Experts have tips on how to stay safe.

The illness, which has sickened thousands across much of the United States, is on track to contribute to the largest outbreak in recent history.

Cyclospora, a parasite that causes intestinal illness, is sickening many people across the United States. Health experts have tips for avoiding infection.

Cyclospora, a parasite that causes intestinal illness, is sickening many people across the United States. Health experts have tips for avoiding infection.