Canadian province of Ontario has 4 swine flu cases

VANCOUVER, British Columbia (Reuters) - The Canadian province of Ontario said on Tuesday it has confirmed four cases of swine flu, bringing Canada's total of confirmed cases to 13.

The four Ontario cases were all mild and involved people who had recently travelled to Mexico, provincial health officials said.

The province of Alberta also confirmed two cases on Tuesday and British Columbia, which already had two cases, confirmed a third case on Tuesday.

(Reporting Allan Dowd, editing by Peter Galloway)