Vox: There’s a new, mysterious pneumonia outbreak in China

There’s a mysterious outbreak in China causing dozens of people to fall sick with pneumonia, a serious respiratory infection that’s commonly triggered by the flu virus.

What sets this pneumonia outbreak apart: The infection is caused by an unknown pathogen. And the outbreak has been linked to a food market, where vendors peddle seafood and animals, such as birds and rabbits.

So far, the infection doesn’t appear to be spreading from person to person. This could mean a new disease has made the leap across species, from animals to humans, according to the World Health Organization’s first update on the outbreak, released Sunday.

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