Your immune system: The secret to fighting colds, flu and COVID-19 | CBC Kids News

Achoo, cough, sniff!
Ever wondered why you get sick and how your body fights off illness?
The answer is our immune system - a series of complex biological defences that usually stop invaders in their tracks.
Watch the video to learn how our immune system works and what are the three types of immunity that protect us each and every day.
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