While exact numbers are unknown, the Michigan Department of Health and Human Services has reported 572 cases of cyclosporiasis as of July 4, and New York has reported more than 10

It's invisible to the naked eye, difficult to trace and can cause weeks of diarrhea. Here's what to know about the parasite, Cyclospora.

San Antonio Metro Health is tracking local cryptosporidiosis cases and urging summer swimmers to take precautions. Soap-and-water handwashing is key, avoid swallowing pool water, and stay out if you have diarrhea.

People usually become infected from eating contaminated food or water.

Some states report higher numbers of cases than usual for this time of year