Foodborne Parasite Sickens 100 in Massachusetts. No Source Has Been Found.

Cases of an intestinal parasite have surged in Massachusetts in recent months, according to health officials.

Since May, more than 100 people in the state have been sickened by a parasite called Cyclospora, according to the Massachusetts Department of Public Health (DPH). This case count is much higher than usual — during the past three years, only 18 to 33 cases have been reported in the state each year.

The single-celled parasite, Cyclospora cayetanensis, is typically transmitted through contaminated food, but so far, health officials have not identified a food source responsible for the Massachusetts outbreak.

Infections with the parasite are most common in tropical and subtropical countries. But in the United States, outbreaks of the illness, known as cyclosporiasis, have been linked with imported fresh produce, including raspberries, basil, snow peas, mesclun lettuce and cilantro, according to the Centers for Disease Control and Prevention (CDC).

Symptoms typically include watery diarrhea, loss of appetite, abdominal cramping, nausea, and prolonged fatigue, according to DPH.

Massachusetts isn't the only state with a spike in Cyclospora cases this year. Officials in Virginia are investigating dozens of suspected cases of the parasite, according to The Washington Post. And officials in Maryland confirmed 42 cases of the parasite, most of which occured in the last two weeks, The Post reported. It's unclear if all of the outbreaks are connected.

Overall, at least 11 states reported cases of Cyclospora from May 1 through June 27, according to data from the CDC.

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Originally published on Live Science.

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