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(NEXSTAR) – It’s still unclear what has caused more than a thousand people to fall ill with a condition that can cause “explosive” diarrhea, but it is clear that some states have been more impacted than others.
The Centers for Disease Control and Prevention said that, between the start of May and mid-June, at least 145 cases of cyclosporiasis had been reported in the U.S. Cases of the parasite-based sickness are common each year from May through August, but some states are seeing larger-than-average spikes in cases.
Michigan alone has confirmed nearly 1,000 cases so far. On average, the state usually sees about 50 cases a year.
Because many people are able to recover from the illness without medical care, it’s possible that case counts are even higher.
The map below shows roughly how many cases of cyclosporiasis have been confirmed in each state as of Wednesday, July 8. However, some of the data include how many cases have been reported this year, and may not fall into the ongoing CDC investigation.
While Michigan has seen the most cases as of late, at least four more states have recorded more than 100 cases.
As of Wednesday, the state of New York had confirmed 394 cases, 273 of which were in New York City alone. Ohio has reported 177 cases, while Illinois has recorded 141, according to local reports. In North Carolina, the case count sits at a reported 110.
Cyclosporiasis is caused by Cyclospora cayatenensis, a parasite that is rare in the U.S. It can be spread through food and water that have been contaminated with feces. Those who become ill may have picked up the parasite while traveling to a country where it is commonly found, according to Wisconsin health officials.
In the U.S., cases are more frequently tied to contaminated fresh produce, like romaine lettuce, basil, cilantro, snow peas, and raspberries. The CDC is still working to determine the cause of the cases reported in the U.S. The agency said there is “currently no evidence of a single, multistate” outbreak.
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