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‘Tridemic’ causing new health-care impacts across Canada

This year's cold and flu season has come in with a punch, and the combination of medicine shortages and overwhelmed hospitals has led to parents and medical professionals taking on more than they could handle. In Canada, the U.S. and the U.K., cases of the flu are higher than they've been in decades. But is our immunity compromised, is it a lack of vaccines or a combination of both? Ross Lord gets some answers.