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Most people recover fully, but it can take several weeks for intestinal problems to disappear. Infants and people with weaker immune systems, and there is currently no vaccine for the disease.

Health officials say they are currently investigating possible “locally-acquired” infections, noting imported fresh produce as “items of interest.” The disease is spread by eating or drinking something that has come into contact with feces.

Though uncommon in food and drinking water in Canada and the United States, the parasite often persists on fruit and vegetables even after they have been washed. Public Health Canada recommends that people cook vegetables and fruit imported from Peru, Cuba, India, Nepal, Mexico, Guatemala, Southeast Asia and Dominican Republic.

Last week, health officials in Texas also reported a major outbreak of the disease, and are continuing an investigation into fresh produce as a possible source. After a series of outbreaks linked to imported produce from Puebla Mexico in 2015, the U.S. Food and Drug Administration banned imports from the region during summer months.

Previous outbreaks of Cyclospora have been linked to pre-packaged salad mix, basil, cilantro, raspberries, blackberries, and snap-peas.

The last major outbreak in Canada was in October, 2015 when 97 cases were reported in the same four provinces. Public Health Canada was never able to determine the source of the outbreak.