KNOXVILLE, Tenn. (WOKI / WVLT) — The Knox County Health Department is reporting an increase in local cases of cyclosporiasis as health officials continue monitoring a nationwide outbreak linked to the foodborne parasite.
According to the health department, 11 cases have been confirmed in Knox County so far in 2026, including nine cases reported since July.
While the number is higher than Knox County typically experiences, officials say local case counts remain significantly lower than those reported in some other parts of the country.
The increase comes as Tennessee and other states continue to see elevated numbers of infections tied to the parasite Cyclospora, which causes the illness known as cyclosporiasis.
National Outbreak Continues
Health officials say more than 10,000 confirmed cases have been reported nationwide since May 1.
In Tennessee, reported cases currently range between 50 and 199 statewide, according to public health data.
Authorities say two deaths have been linked to the outbreak. Both victims were Michigan residents with underlying health conditions, and officials believe illness and dehydration may have contributed to their deaths.
How the Parasite Spreads
The Knox County Health Department says cyclosporiasis is a form of foodborne illness caused by ingesting microscopic parasites through contaminated food or water.
The illness commonly spreads when food becomes contaminated through contact with infected human waste.
Past outbreaks have been associated with:
- Bagged salad mixes
- Fresh cilantro
- Fresh basil
- Raspberries and other fresh produce
Common Symptoms
The illness is perhaps best known for causing severe or “explosive” diarrhea, but health officials say symptoms can vary.
Other symptoms may include:
- Loss of appetite
- Weight loss
- Bloating
- Increased gas
- Fatigue
- Abdominal pain
- Nausea
- Vomiting
- Low-grade fever
Symptoms can last for days or even weeks if left untreated.
Prevention Tips
Health officials say proper food handling remains the best defense against infection.
Residents are encouraged to:
- Wash hands thoroughly with soap and water before and after handling produce
- Rinse fruits and vegetables under running water before eating or preparing them
- Scrub firm produce with a clean produce brush
- Refrigerate cut or peeled produce within two hours
- Consider choosing produce that is easier to wash thoroughly
Officials note that fruits with grooves or textured surfaces, such as raspberries, can be more difficult to clean completely.
When to Seek Medical Care
Health Department officials recommend contacting a healthcare provider if symptoms of cyclosporiasis develop, particularly prolonged diarrhea, dehydration or severe gastrointestinal illness.
Public health experts continue investigating infection sources while encouraging residents to follow safe food handling practices throughout the outbreak.
