Canada’s Public Health Agency is investigating an outbreak of E. col O157:H7 possibly linked to leafy greens (lettuces, kale, spinach, arugula or chard).

According to a statement released by the agency on Wednesday, there are currently 12 people sickened in four provinces (Alberta, 9; Saskatchewan, 1; Ontario, 1, and Newfoundland and Labrador, 1). Illness onset dates range from March 13-31, 2015.

The agency indicated that no specific food product had yet been identified as the source and that the investigation is continuing in collaboration with federal and provincial public health officials. When and if the source is identified, the agency will inform the public and make sure that the contaminated product is promptly removed from the marketplace.

It does leave you with the question of who made the salad?  Was it grown in the United Sates or Canada?