NYC health officials investigate surge in cyclosporiasis cases as residents adjust produce habits

New York City has recorded over 800 laboratory-confirmed cases of cyclosporiasis since early May, with more than 500 in the five boroughs, according to state and city health data. The parasite, which spreads through fresh fruits and vegetables, can cause weeks of gastrointestinal illness, including severe diarrhea, the Centers for Disease Control and Prevention says.

City and state health officials have not identified a specific food source for the surge, although similar outbreaks elsewhere have been linked to recalled iceberg lettuce from a Mexican supplier. The New York Department of Health continues to recommend that consumers wash fruits and vegetables thoroughly and, for those who are especially concerned, cook produce to eliminate the parasite.

"I haven't been changing my diet and I don't know that you should change yours," State Health Commissioner Dr. James McDonald told reporters. He added that monitoring case counts and practicing good hygiene remain the best safeguards.

Among residents, responses vary. Some shoppers at the Union Square Greenmarket report buying more locally grown items and opting for whole, unprocessed greens, while others are avoiding lettuce altogether or substituting frozen or cooked vegetables. Local farmer Marc Phillips noted a modest increase in lettuce sales, describing it as a "flight to safety" when food-supply concerns arise.

Food-safety experts caution that local produce is not immune to contamination but argue that known sources and trusted farms reduce risk. "If you know the farm, if you've bought produce from them before and you trust them, I think that's a good sign," said Columbia University professor Lew Ziska.

The investigation continues as health workers interview patients about recent meals and examine potential common suppliers. Because symptoms can appear up to two weeks after exposure, pinpointing the origin remains challenging.