World Health Organization declares coronavirus a public health emergency of international concern

Last week, the organization said the virus did not yet constitute the emergency declaration. But with rising numbers and evidence of person-to-person transmission in a handful of cases outside of China, WHO leadership called the committee back together due to the "potential for a much larger outbreak," WHO Director-General Tedros Adhanom Ghebreyesus told reporters earlier this week.

WHO defines a public health emergency of international concern as "an extraordinary event" that constitutes a "public health risk to other States through the international spread of disease" and "to potentially require a coordinated international response." Previous emergencies have included Ebola, Zika and H1N1.