The Public Health Agency of Canada (PHAC) has confirmed that a diarrheal parasite outbreak affecting more than 1,200 people in Michigan has not spread to Canada. The parasite, Cyclospora cayetanensis, causes severe gastroenteritis and is typically transmitted through contaminated food or water.
Outbreak details and PHAC response
As of July 9, 2026, Michigan health officials reported over 1,200 confirmed cases of cyclosporiasis, a intestinal infection caused by the microscopic parasite Cyclospora. Symptoms include watery diarrhea, stomach cramps, nausea, vomiting, and fatigue, which can last for weeks if untreated. The outbreak has spurred investigations by the U.S. Centers for Disease Control and Prevention (CDC) and state health authorities.
PHAC stated that no cases linked to the Michigan outbreak have been identified in Canada. The agency is monitoring the situation closely and advises Canadians traveling to affected areas to take precautions, such as washing fruits and vegetables thoroughly and drinking safe water. “We are in contact with U.S. health partners and have enhanced surveillance to detect any potential cases,” a PHAC spokesperson said.
What is cyclospora and how to avoid it
Cyclospora is a single-celled parasite that infects the small intestine. It is commonly found in tropical and subtropical regions but can cause outbreaks in temperate climates when imported produce is contaminated. The parasite has an incubation period of about one week, and diagnosis requires specific stool tests. Treatment involves antibiotics like trimethoprim-sulfamethoxazole.
To reduce risk, health officials recommend washing all produce, avoiding raw or undercooked food from high-risk areas, and practicing good hand hygiene. The Michigan outbreak has been linked to fresh produce, though the exact source remains under investigation.
Canadians who experience persistent diarrhea after travel should seek medical attention and inform their healthcare provider about recent travel history. PHAC continues to update its travel health notices as needed.
