A day after a team of World Health Organization (WHO) medical experts arrived in China to help investigate the deadly coronavirus outbreak, the health agency’s director said the virus poses “a very grave threat for the rest of the world.”

Over 1,000 people in China have died after contracting the virus, which has sickened over 43,000 others globally. Just under 400 of those cases have been confirmed in countries outside of China.

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“With 99 percent of cases in China, this remains very much an emergency for that country, but one that holds a very grave threat for the rest of the world,” WHO director-general Tedros Adhanom Ghebreyesus said during a video conference with hundreds of researchers on Tuesday.

In an appeal to researchers who had dialed in to the…