Articles sur pathogen

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A virus like SARS can shut down cytokine production, enabling it to multiply to higher levels and causing significant infection and even death. (THE CANADIAN PRESS/Kevin Frayer)

Explainer: How the human body first fights off pathogens

We've all endured infections. Here's how it works when our bodies are attacked by viruses, bacteria or parasites, and our innate immune system becomes the first line of defence.

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