How a deadly virus is born - a podcast by ABC Radio

When people in the Chinese city of Wuhan started getting sick after visiting a local market, everyone thought it was a pneumonia outbreak.

It turned out to be a new virus.

This strain is deadly, it's spreading and scientists are still trying to work out how to stop it. So far it's infected more than 400 people and killed nine.

So what does it take for a virus like this to evolve and how worried should you be?

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