The effectiveness of this season’s flu shot has been extremely low, with the vaccine preventing only 10 to 20 per cent of infections caused by the dominant H3N2 strain affecting Canadians, researchers have found.
The flu shot was 55 per cent effective overall in preventing cases of the respiratory illness caused by the dominant B strain of influenza affecting Canadians this season, researchers estimate. (Colleen Underwood/CBC) The effectiveness of this season’s flu shot has been extremely low, with the vaccine preventing only 10 […]