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Little-known virus is an underestimated threat, say experts. Here’s how to keep safe from HMPV.

The U.S. CDC says cases of human metapneumovirus – or HMPV – spiked this past spring. The virus can cause just as much misery as the flu, but most people have never heard of it. CNN’s Anna Coren talks to viral researcher Dr. Jorge Rodriguez about what you need to look out for and how to stay safe.