The World Health Organization has declared the situation a global health emergency. Here’s a timeline of what we know so far about the outbreak. Dec. 31Chinese authorities were treating dozens of cases of pneumonia of unknown cause. On Dec. 31, the government in Wuhan, China, confirmed that health authorities were treating dozens of cases. The first confirmed cases of the coronavirus outside mainland China occurred in Japan, South Korea and Thailand, according to the World Health Organization’s first situation report published on Jan. 20.

Source: International New York Times February 13, 2020 22:18 UTC