My Epidemiology

Disclaimer: I am not a medical professional. I have no affiliation with the sources cited.

Cyclosporiasis has continued to make national headlines across the United States as the outbreak continues.

What exactly are we dealing with? What are the causes and symptoms? How can I stay safe?

Cyclosporiasis is a disease caused by the Cyclospora cayetanensis parasite.

A foodborne and waterborne illness, it is most commonly spread via unwashed or inadequately washed produce or contaminated drinking water.

Consumption of a contaminated food source – such as bagged salad or a cucumber – can introduce the microscopic parasite to the body. Once ingested, it can take anywhere from 2 days to 2 + weeks to experience symptoms (This is known as the incubation period). While potentially contagious, it is exceedingly rare for human transmission, as the parasites need time to mature outside of the body before they are able to infect someone else.

If someone does develop a cyclosporiasis infection, the most common symptom is watery (or explosive) diarrhea. Other symptoms can include bloating, cramping, nausea, vomiting, fatigue, and other general flu-like symptoms.

Testing for cyclosporiasis involves a stool sample. A doctor may send said sample to a diagnostic laboratory for testing, though it can be difficult to definitively identify the presence parasites.

Cyclosporiasis is rarely fatal, especially in developed countries like the US. The main risk of death comes in the form of dehydration, which is common among diarrhea-causing diseases. In fact, as of August 24th, 2026, of the 17,180 CDC-confirmed cases, there have been 922 hospitalizations and only 2 deaths. This means that the mortality rate among confirmed cases is only 0.01% – or in more positive terms, the survival rate is 99.9%.

Treatment involves antibiotics and rehydration. Your doctor will determine the best course of action, though the most common prescription will be for trimethoprim-sulfamethoxazole (also known as bactrim). For those with Sulfa antibiotic allergies, alternatives will be used.

Because of the pre-existing dehydration and the treatment course of antibiotics, infected peoples should NOT consume alcohol until they are cleared by a medical professional.

This is not medical advice. I am not a doctor. Ask your doctor if you believe you are suffering from cyclosporiasis.

Sources:

Centers for Disease Control and Prevention

Food and Drug Administration

Johns Hopkins University