A microscopic parasite is driving a surge in foodborne outbreaks across the United States. Public health officials are now investigating what is behind the rise in cases, which has spread well beyond a single region and drawn national attention.
The scale of the outbreak has grown as health authorities track it. According to a CDC update, the illness known as cyclosporiasis is now affecting 34 states, with more than 1,600 confirmed cases reported across the country, and officials expect the number of cases to keep climbing through the end of August. Michigan remains the hardest hit, recording an increase of more than 600 cases, a level that officials describe as more than fifty times the number the state would normally see in an entire year.
Investigators have begun to narrow their focus, though the exact source has not been confirmed. According to the account, preliminary results have pointed to fresh produce, and in particular to lettuce or salad greens, as a possible vehicle for the parasite. One national chain, Taco Bell, has said it will voluntarily and temporarily remove certain ingredients, while noting that the health authorities have not established a definitive link between any of its products and the outbreak.
Officials have also offered an explanation for why the numbers may be climbing so steeply. According to the account, the parasite is likely arriving on produce shipped into the United States from contaminated areas abroad, with warmer weather allowing it to survive the journey before it lands on the dinner table. Because earlier surges have often involved several separate outbreaks unfolding at the same time, the country's complex distribution system can let the parasite travel under the radar until testing begins.
The parasite spreads through contaminated food or water. Those who fall ill can experience a range of uncomfortable symptoms, including watery diarrhea, cramping, bloating, fatigue and nausea, and in some cases vomiting. The illness can take a heavy toll over several days, and its longer incubation period makes it especially hard for investigators to pin down exactly what someone ate before they became sick.
The timing fits a familiar pattern, but with a worrying twist. Infections usually occur during the summer months, yet this year states are already seeing more cases than normal. That early and elevated spread is part of what has prompted health experts to look more closely at the outbreaks.
The CDC has offered some reassurance about the course of the illness. Symptoms can take anywhere from two to fourteen days to appear, and the illness is not usually life threatening. It can often be treated with antibiotics, though without treatment it can last from a few days to more than a month.
In the meantime, officials are focusing on prevention. Health experts are urging people to thoroughly wash fresh produce and to cook vegetables when possible. For leafy items such as lettuce, they advise removing the outer layers of leaves first and then washing thoroughly, while produce with a firmer skin should also be washed carefully.