HEALTH

United States investigates multistate cyclosporiasis outbreak source

PUBLISHED Jul 7, 2026, 1:55 PM ET

Read, Watch or Listen

U.S. health authorities are investigating a rapidly expanding outbreak of cyclosporiasis, a parasitic infection that causes severe watery diarrhea, across at least 18 states. As of early July, Michigan reported nearly 700 cases, a sharp increase from 170 less than a week earlier and far above its usual annual average of about 50. The Centers for Disease Control and Prevention recorded more than 400 cases nationally by last Friday and described the clusters as concerning. The Food and Drug Administration is working with the CDC to identify the contaminated food source, which is suspected to involve raw produce or water but remains unknown.

By Emily Rhodes | JQJO News

Timeline of Events

Historically, annual Michigan cases averaged 50
Last Friday, CDC reports 400-plus national cases
Last week, Michigan cases surge to 170
Monday, Michigan total climbs to about 700
July 2, Ohio confirms 177 cyclosporiasis cases
Early July, 18 states report confirmed infections
Early July, CDC reports 20 hospitalizations nationally
Ongoing, CDC and FDA trace suspected produce source

News Intelligence

Cyclosporiasis is a nasty bug causing severe diarrhea. It's spreading fast across 18 states, including a big jump in Michigan. The source is suspected to be raw produce or water. Until officials find the culprit, consider washing produce thoroughly and drinking filtered water.