CASES of cyclosporiasis are on the rise in a multi-state outbreak in the US, according to the US Centers for Disease Control and Prevention (CDC).
As of 8th July 2026, there are now nearly 1,000 cases identified in Michigan alone – a jump from 572 cases reported in the state on 4th July.
According to the CDC’s latest surveillance data, there were 145 cases reported by 17 states from 1st May to 16th June.
Of theses cases, 20 resulted in hospitalisation with no reported deaths.
Whilst cyclosporiasis is not usually life-threatening, dehydration can cause severe illness, particularly among vulnerable groups.
The data do not account for recent spikes in cases experienced in several states.
Cyclosporiasis
Cyclosporiasis is an intestinal illness cause by the Cyclospora parasite.
People can become infected by consuming food or water that contains the parasite.
Cyclospora infects the small intestine and usually causes frequent, watery, and explosive diarrhoea.
The time between being exposed and becoming sick is usually around one week but can range from two days to two weeks or more.
Untreated, cyclosporiasis may last from a few days to more than a month.
Previous outbreaks in the US and Canada have been tied to bagged salad mixes and kits, fresh coriander, fresh basil, raspberries, snow peas, and green onions.
Ongoing Investigation in Michigan
Michigan officials first announced the outbreak on 1st July.
The state usually only reports around 50 cases annually.
Natasha Bagdasarian, Chief Medical Executive, Michigan Department of Health and Human Services (MDHSS), Michigan, US, said last week: “Outbreaks of cyclosporiasis have been occurring across the United States and now here in Michigan.
“Based on the unusual number of cases we have identified in a little over a week, we anticipate additional cases of illness being reported.
“We recommend Michiganders contact their healthcare provider if they experience sudden, ongoing diarrhoea and reach out to their local health department if additional members of their family are suffering from the same symptoms.”
As of 4th July, no specific produce grower or supplier, or specific produce type, has been identified as the source of the outbreak.
The MDHSS is investigating with local health departments and the Michigan Department of Agriculture and Rural Development.
Featured image: aapsky on Adobe Stock
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