North Texas health departments are using an extensive questionnaire to try and track down the source of a food-borne illness.

The number of cyclospora cases continues to rise.

Patients who test positive for the intestinal illness are being given a 16-page questionnaire developed by the Centers for Disease Control. They're being asked about specific restaurants where they've eaten, and where they have purchased certain vegetables and fruits.

Zachary Thompson, director of Dallas County Health and Human Services, visited News 8 Daybreak with an update on the investigation.

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