Health Canada was investigating an outbreak of E. coli bacteria.
The outbreak seemed to be linked to romaine lettuce, however they still have no idea which product is causing the infections.
Quebec and Newfoundland and Labrador have each reported 13 cases, Ontario has had 8, New Brunswick five and Nova Scotia one.
The Public Health Agency of Canada says the cases of E. coli 0157 seemed to be associated with the consumption of romaine lettuce.
Ten additional cases have been reported and the investigation into the outbreak is continuing.
The outbreak investigation is continuing and the agency says the public health notice will be updated on a regular basis as the investigation evolves.
Those who became ill range between the ages of four and 80 and 70 per cent of those who became sick are female.