U.S. health officials and the Centers for Disease Control and Prevention (CDC) are investigating a widespread outbreak of the parasite Cyclospora.
The scale of the infection poses a significant public health challenge because the parasite is difficult to trace and causes severe gastrointestinal distress.
Public health experts said the parasite causes what doctors are calling "explosive diarrhea" [5]. The outbreak has reached a broad geographic scale, with cases reported in at least 34 states [3]. While some reports highlight clusters in the Midwest, the spread appears national [3], [4].
Data on the number of infections varies. Some reports indicate that new cases have topped 1,500 [1], while other data suggests nearly 7,000 Americans are currently dealing with the parasite [1].
Officials are working to identify the primary source of the contamination. In Georgia, health officials said contaminated lettuce and salad greens are driving the cyclosporiasis cases [2]. However, investigators have not yet determined a singular source for the infections occurring across the rest of the country [4].
The CDC said that Cyclospora is one of the hardest foodborne pathogens to trace [1]. Because the parasite can hide in various produce items, identifying the specific farm or distributor responsible for a multi-state outbreak often takes considerable time.
Patients affected by the parasite typically experience prolonged diarrhea, stomach pain, and fatigue. Health officials continue to monitor the situation as more cases emerge this month.
“"Cyclospora is one of the hardest foodborne pathogens to trace."”
The difficulty in tracing Cyclospora, combined with the high number of affected states, suggests a failure in the food supply chain at a distribution or wholesale level rather than a single local farm. The disparity in case counts indicates a rapidly evolving situation where health officials are struggling to keep pace with the infection rate, highlighting the vulnerability of the U.S. produce network to parasitic contamination.
