Around 1 in 5 people across the world have underlying conditions that put them at risk of developing severe COVID-19 if infected with the coronavirus, according to a new study. That adds up to around 1.7 billion people worldwide.

The novel coronavirus has infected more than 8 million people globally and killed more than 437,900, according to the latest numbers from the Johns Hopkins dashboard. The virus has severely impacted some people, while causing only mild or no symptoms in others, according to a previous Live Science report

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