(NewsNation) — A new cyclospora outbreak is under investigation as at least 72 people have been sickened and the source of the parasite is unknown.

The Food and Drug Administration identified the outbreak in a Wednesday update, although it did not provide any information on the location or source.

The outbreak is currently listed as being distinct from a larger one linked to shredded iceberg lettuce grown in Mexico and sold by Taylor Farms. The company issued a voluntary recall of the products, which were sold in 27 states.

Outbreaks of cyclospora are common in summer, as the parasite thrives on hot weather, but this year is reaching record numbers, with more than 4,000 cases confirmed by the Centers for Disease Control and Prevention so far. State records suggest there could be as many as 11,000 cases, not all of which have been confirmed by testing.

Cyclospora is a parasite transmitted through feces. Produce can become infected through contaminated water. One challenge of cyclospora is that it is difficult to wash off due to the way it clings to food.

If ingested, Cyclospora can cause an illness characterized by explosive diarrhea. The parasite can be treated with antibiotics, and without medication, it can last up to a month.

The new outbreak suggests the FDA believes the cases are clustered around a common source, with no indication of which food the agency thinks may be spreading the parasite.

The FDA is also investigating a significant number of other foodborne outbreaks, including salmonella, listeria, E. coli and clostridium botulinum.