US Cyclospora Outbreak Spreads to Four States as CDC Traces Source

The U.S. Centers for Disease Control and Prevention (CDC) recently issued a latest epidemiological update indicating that the outbreak of cyclosporiasis, caused by the protozoan parasite *Cyclospora cayetanensis*, continues to expand. Four additional states—Illinois, Kansas, Oklahoma, and Pennsylvania—have now been affected. This multi-state foodborne disease outbreak has once again triggered high alert among U.S. public health departments, with relevant authorities actively tracing the exact source of the contaminated food and urging the public to remain vigilant.

According to data from the CDC, cyclosporiasis is an intestinal parasitic disease primarily transmitted through the consumption of water or food contaminated with feces. Infected individuals typically experience symptoms such as watery diarrhea, loss of appetite, weight loss, abdominal cramps, bloating, nausea, and fatigue. If left untreated, the illness can persist for weeks or even months. U.S. public health agencies have long made foodborne pathogen surveillance one of their core missions, continually tracking the dissemination pathways of various parasitic and bacterial infections through a nationwide disease monitoring system.

Headquartered in Atlanta, Georgia, and operating under the U.S. Department of Health and Human Services (HHS), the CDC is the highest national authority for public health and disease prevention in the United States. Its primary responsibility is to protect public health security domestically and globally through disease control and prevention, with operations covering infectious disease prevention and control, environmental health, occupational safety, and health promotion. In recent years, the U.S. federal government has been advancing an organizational restructuring plan for the Department of Health and Human Services, which is expected to further strengthen the CDC's response and integration capabilities in core infectious disease operations.

In response to the expanding cyclosporiasis outbreak, public health experts pointed out that because such parasitic infections are often closely tied to fresh produce supply chains—such as imported or domestic lettuce, berries, and herbs—completely cutting off the source of contamination at the front end of the supply chain is extremely difficult. Federal and state health departments are currently stepping up investigations into relevant retail channels and suppliers, issuing safety alerts for high-risk foods, and reminding the food service industry and consumers to enhance washing and hygiene management to reduce the risk of infection.

For Taiwan, this foodborne parasitic outbreak within the United States highlights the shared challenges that globalized food supply chains face in modern public health management. With frequent international trade in fresh agricultural products, the control of transnational food safety risks is severely tested. This incident not only provides a valuable reference for Taiwan in the inspection of imported agricultural products and the surveillance of foodborne diseases, but also serves as a reminder to domestic health authorities that they must continuously strengthen border quarantine and epidemiological investigation capabilities in the face of climate change and global trade expansion to ensure the dietary safety of domestic consumers.