WHO Declares Coronavirus Outbreak A Global Health Emergency

Passengers in a subway station in Hong Kong on Wednesday wear masks amid the coronavirus outbreak.

Kin Cheung / AP

Updated at 3:55 p.m. ET

The World Health Organization announced Thursday that the outbreak of a deadly and fast-spreading strain of coronavirus constitutes a global health emergency.

“Over the past few weeks, we have witnessed the emergence of a previously unknown pathogen, which has escalated into an unprecedented outbreak, and which has been met by an unprecedented response,” WHO Director-General Tedros Adhanom Ghebreyesus told reporters in Geneva.