Diarrhoea-inducing Cyclospora outbreak spreads across US

A diarrhoea-inducing Cyclospora outbreak continues to spread across the United States, with over 1,645 confirmed cases reported as of Tuesday, local time. The U.S. Centers for Disease Control and Prevention (CDC) is currently investigating approximately 5,100 additional suspected cases across 34 states. Michigan, which has been the hardest hit, accounts for nearly two-thirds of the total cases, with 3,309 reported so far. The outbreak began with reports of symptoms in four primary states, Michigan, Ohio, West Virginia and Kentucky, on or after June 22. Since then, other states including New York, Illinois, New Jersey, North Carolina and Texas have each documented 31 or more cases. These numbers are likely to increase as the CDC continues to receive updated data. Delays in reporting are common, partly due to the time it takes for individuals to develop symptoms following exposure. Illness onset can occur anywhere from two days to several weeks after infection, and the peak season for Cyclosporiasis typically runs from May 1 through August 31. Cyclosporiasis is an intestinal infection caused by the Cyclospora parasite, which is usually contracted through consumption of contaminated food or water. Contaminated produce, especially raw fruits and vegetables, is a common transmission route. Symptoms include diarrhoea, nausea and other gastrointestinal issues, ranging from mild to severe. Children, older adults and individuals with compromised immune systems face a heightened risk of complications. While the condition is rarely fatal, untreated infections can last for weeks and may require hospitalization due to dehydration. Michigan health officials have pointed to lettuce as a potential source of the outbreak, though no specific supplier or grower has yet been officially linked. The Food and Drug Administration is conducting traceback investigations into multiple produce items, including the lettuce implicated by Michigan. These investigations involve collecting detailed dietary histories from affected individuals and tracing the supply chain back to the point of origin, potentially identifying farms or growers associated with the contamination. Cyclospora is classified as a nationally notifiable pathogen in the United States, meaning most states maintain comprehensive data collection and regularly share this information with the CDC’s disease surveillance system. Healthcare providers in 47 states are legally required to report cases of cyclosporiasis to public health authorities. Despite recent funding cuts that led to the discontinuation of tracking certain pathogens, including Cyclospora, by the Foodborne Diseases Active Surveillance Network (FoodNet), participating states continue to report cases on a national level. This ensures consistent data collection and monitoring during the current outbreak. To prevent further spread, the CDC recommends washing hands with soap and water before and after handling raw fruits and vegetables, thoroughly cleaning produce, and using a clean brush to scrub firm items. The parasite is not commonly transmitted directly from person to person, making proper hygiene and food safety practices essential in reducing the risk of infection. As the investigation continues, public health officials remain focused on identifying the exact source of the outbreak and implementing measures to safeguard the population.