Iowa’s cyclospora cases rise as officials investigate possible outbreak link

Iowa has reported 184 cases of cyclosporiasis this year, more than twice the number recorded at the same point in 2025, while health officials investigate whether some infections are connected to a larger national outbreak.

The Iowa total stood at 184 cases as of July 23, compared with 61 by the same point last year, according to Iowa Public Radio reporting citing Iowa Health and Human Services. Iowa HHS has identified cases that may be related to the multistate outbreak, but more information is needed to confirm that connection.

What officials know about the outbreak

The CDC reported July 28 that it had received reports of 6,707 laboratory-confirmed, domestically acquired cyclosporiasis cases from May 1 through July 27. The cases were reported in 45 states. At that point, the agency reported 423 hospitalizations and no deaths in its domestic surveillance count.

That federal count is not a total of all illnesses in the United States. The CDC said it was aware of more than 11,500 additional cases that were not laboratory confirmed or still required investigation. CDC surveillance updates do not include probable cases, while state totals may include both probable and confirmed cases.

The CDC is investigating several clusters, including a nine-state outbreak linked to iceberg lettuce. On August 3, the agency said two people in Michigan with underlying health conditions had died as part of that outbreak. Those deaths were announced after the July 28 national surveillance update and are not reflected in the 6,707-case summary.

Taylor Farms recalled iceberg lettuce sourced from central Mexico on July 17. The FDA says affected products were distributed to Iowa and other states, but the recall applies to listed products and lots. It does not mean that all iceberg lettuce, or all fresh produce, is contaminated.

The CDC says its figures are preliminary and may increase because of reporting delays. The agency estimates a reporting lag of about six weeks between illness onset and case reporting.

How Iowa is investigating

Iowa HHS guidance requires health care providers and laboratories to report cyclosporiasis cases. Local public health agencies follow up with individual patients, and a broader investigation is warranted when case numbers are higher than usual or an outbreak is suspected.

Investigators use patient interviews, laboratory information and exposure histories to look for common food or water sources. Iowa HHS says the University of Iowa State Hygienic Laboratory provides stool testing for Cyclospora. State and local officials may also coordinate with food-safety agencies if a food or water source is suspected.

Iowa’s increase does not by itself establish that the state’s cases came from the recalled lettuce or are part of the nine-state outbreak. Public health officials use case interviews, laboratory results and food-traceback information to determine whether infections are connected.

Symptoms can last for weeks

Cyclosporiasis is caused by the microscopic parasite Cyclospora cayetanensis. Iowa HHS lists watery diarrhea as the typical symptom, along with nausea, vomiting, abdominal cramping, gas or bloating, fatigue, appetite loss, weight loss and low-grade fever.

Symptoms generally begin about one to two weeks after exposure, with an average of about one week. CDC guidance says illness can last from several days to a month or longer, and symptoms such as diarrhea may go away and return. Illness may last longer or be more serious for people who are immunocompromised.

The parasite is usually spread by consuming food or water contaminated with human feces. Iowa HHS says direct person-to-person transmission is not likely because the parasite must mature outside the body before it becomes infectious.

When to contact a health care provider

Persistent watery diarrhea or other prolonged gastrointestinal symptoms can have several causes. Testing may be needed to determine whether Cyclospora is involved. CDC says routine stool tests do not always screen for the parasite, so patients may need to ask a health care provider about Cyclospora-specific testing.

Medical advice is especially important for people with severe or prolonged illness, signs of dehydration, substantial weight loss or weakened immune systems. Residents should follow guidance from a health care provider rather than try to diagnose the illness from symptoms alone.

What residents should do now

Residents who bought recalled Taylor Farms products should check the recall notice, discard affected items or return them as directed, and clean surfaces that may have touched the recalled lettuce. The recall is product-specific; residents should not assume that all iceberg lettuce or fresh produce is unsafe.

CDC recommends washing hands and fresh produce under running water before eating, cutting or cooking. Washing cannot guarantee removal of Cyclospora, and cooking can kill the parasite.

For now, Iowa’s case increase and the national outbreak remain related questions, not a confirmed single event. Iowa HHS and federal and local partners are continuing interviews, laboratory review and outbreak investigations. Case totals and any confirmed source connections may change as delayed reports and additional testing are processed.

Sources

Look for updates to this story

Discover more from Interactive News

Subscribe to get the latest posts sent to your email.