Cyclospora cases rise across US as officials search for source

A cyclospora outbreak is spreading across the U.S., and health officials have not yet tied the illnesses to a single food or water source. For investors, that uncertainty matters because restaurants, grocers and agriculture companies can face supply chain disruption or consumer concern when foodborne outbreaks are linked to specific ingredients.

The Centers for Disease Control and Prevention reported at least 843 cases of cyclosporiasis and 86 hospitalizations as of July 9. The agency’s totals may rise because it can take time for state health departments to send reports to the CDC.

Cyclospora is a parasite that can be passed through contaminated food or water. The illness can cause watery diarrhea that lasts for weeks, according to the CDC. Other symptoms can include weight loss and loss of appetite.

State health departments are reporting above-average case counts in places including Michigan, New York, Kentucky and Texas, according to CNBC. The outbreak has not been connected to a shared source, which leaves companies that sell or serve fresh food waiting for clearer guidance from public health officials.

What health officials know so far

The CDC has not identified one product, supplier or location as the cause of the current spread. Past cyclospora outbreaks have been associated with fresh produce, including raspberries, basil, cilantro and lettuce.

Dianna Blau, the CDC’s acting parasitic diseases branch chief, told the Associated Press on July 9 that there is no evidence the parasite has changed in a way that makes it more infectious. Cyclospora is also rarely fatal, according to the information cited by CNBC.

Public health investigators often need time to trace foodborne outbreaks because people may shop at different stores, eat at different restaurants and remember their meals imperfectly. In this case, the lack of a known common source means officials have not announced a targeted recall or named a product category to avoid.

Why food businesses are watching

Restaurants, grocery chains and agriculture businesses can be affected when an outbreak is traced to a crop or supplier. A confirmed link can lead to recalls, temporary sourcing changes or reduced demand for certain foods.

For now, CNBC reported that stocks across restaurants, grocery stores and agriculture companies largely held steady on Monday. Spokespeople for several restaurant chains, including Chipotle Mexican Grill and Restaurant Brands International, told CNBC they are aware of the outbreak but have not seen evidence that their ingredients are at risk. Restaurant Brands International is the parent company of Burger King, Popeyes, Tim Hortons and Firehouse Subs.

That does not mean the outbreak is resolved. It means public health officials have not yet provided evidence pointing to those companies’ food supplies, based on the company statements reported by CNBC.

How to lower risk

The CDC recommends washing fresh produce before eating it and washing hands before handling or preparing food as ways to reduce the risk of foodborne illness.

For people with symptoms such as watery diarrhea, weight loss or loss of appetite, the CDC recommends contacting a primary healthcare provider rather than relying on at-home remedies. Health professionals can prescribe appropriate treatment, and confirmed reports help the CDC track the outbreak more accurately.

Until investigators identify a source, the main takeaway is practical: follow food-safety basics, seek medical care for concerning symptoms and watch for updates from public health agencies.

This story draws on original reporting from CNBC.