Vikram Misra

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Health workers get ready to spray insecticide in advance of the 2016 Summer Olympics, in Rio de Janeiro, Brazil, to combat the mosquitoes that transmit the Zika virus in this Jan. 26, 2016 photo. (AP Photo/Leo Correa, File)

Viruses can cause global pandemics, but where did the first virus come from?

Arinjay Banerjee, University of Saskatchewan; Karen Mossman, McMaster University, and Vikram Misra, University of Saskatchewan

Recent discoveries of ancient viruses are helping scientists understand their origins.
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

Arinjay Banerjee, University of Saskatchewan and Vikram Misra, University of Saskatchewan

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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