Yum shares fall after report US health authorities investigating Taco Bell in cyclosporiasis outbreak

Lab-confirmed cases linked to the recent outbreak of cyclosporiasis have risen to 1,645, the CDC said on Tuesday, up by more than 800 cases from its last update a week ago.

The current U.S. outbreak, which began on May 1, is centered in Michigan, while Ohio and New York have also reported high numbers of cases.

Infections across the country have resulted in 141 hospitalizations as of July 13, according to the health agency. No deaths have been reported.

The CDC said it is also aware of more than 5,100 additional cases that require further analysis and confirmation.

Cyclosporiasis can be contracted by consuming food — typically raw fruits and vegetables — or water contaminated with feces, according to the CDC.