Health experts are investigating why Cyclospora, a food-borne parasite, causes symptoms that come and go, sometimes lasting for weeks. The parasite causes cyclosporiasis, leading to watery diarrhea, loss of appetite, weight loss, stomach cramps, nausea, and fatigue. Symptoms can appear suddenly, then subside, only to return days later.

This relapsing pattern makes diagnosis and treatment challenging. The food-borne parasite is typically spread through contaminated fresh produce, such as raspberries, basil, or lettuce. Outbreaks often occur in spring and summer.

The incubation period ranges from 1 to 14 days. Without treatment, symptoms can persist for weeks or months. Experts are studying the parasite's life cycle and immune response to understand why symptoms recur.

Improved detection methods and public awareness are key to preventing outbreaks. The CDC recommends testing for Cyclospora if patients have prolonged or relapsing diarrhea after consuming imported produce. Treatment involves antibiotics like trimethoprim-sulfamethoxazole.

Understanding the cyclical nature of symptoms is crucial for accurate diagnosis and effective management of cyclosporiasis. Continued research aims to uncover the mechanisms behind the relapsing course of this infection.