Canada reported seven more confirmed cases of swine flu on Tuesday, bringing the total number of cases in the country to 13.

All the new cases are mild ones, with four in Ontario, one in British Columbia and two in Alberta, health officials said.

All the Ontario cases were found in the Toronto area and have been linked to Mexican travel, David Williams, the province's acting chief medical officer of health told a news conference in Toronto.

The illnesses so far appear to be mild and "it's like flu season continuing," he said.

Earlier in the day, health authorities in Alberta confirmed two mild cases in the province, one in Calgary and the other in the northern part of the province.

British Columbia, which already has two cases, confirmed one new case Tuesday afternoon.

Canada's chief public officer of health David Butler-Jones said that although all the cases are mild ones so far, more severe cases may appear and may result in deaths.

The Public Health Agency of Canada is advising against all non-essential travel to Mexico.