National case definition: Cyclosporiasis

Date of last revision: June 2012

Date of last review: August 2018

National notification 

Only confirmed cases of disease should be notified.

Type of surveillance

Routine case-by-case notification to the federal level

Case classification

Confirmed case

Laboratory confirmation of infection in a person with or without clinical illness:

  • Demonstration of Cyclospora cayetanensis oocysts in stool, duodenal/jejunal aspirate or small bowel biopsy

Probable case

  • Clinical illness in a person who is epidemiologically linked to a confirmed case.

Clinical evidence

Clinical illness is characterized by watery diarrhea, loss of appetite, weight loss, abdominal bloating and cramping, increased flatus, nausea, fatigue and low-grade fever. Vomiting may also be noted. Relapses and asymptomatic infections can occur. Some evidence suggests that symptoms may be more severe and long-lasting in immunocompromised individuals.

ICD code(s)

ICD-10 code(s)

A07.8 Other specified protozoal intestinal diseases (includes Cyclospora cayetanensis)

ICD-9/ICD-9CM code(s)

007.5 Cyclosporiasis


Probable case definitions are provided as guidelines to assist with case finding and public health management, and are not for national notification purposes.

The disease is not endemic in Canada; therefore, cases should be investigated as most likely associated with imported food or travel.

Direct person-to-person transmission is unlikely to occur.


Centers for Disease Control and Prevention. MMWR 1997. Case definitions for infectious conditions under public health surveillance. Retrieved February 2017, from

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