Norovirus spreading at 'higher frequency' than expected in Canada

Norovirus is spreading at a 'higher frequency' than expected in Canada, specifically, in Ontario and Alberta, according to the Public Health Agency of Canada.

Norovirus spreading at 'higher frequency' than expected in Canada
Norovirus is spreading at a 'higher frequency' than expected in Canada, specifically, in Ontario and Alberta, according to the Public Health Agency of Canada.