A new strain of virus that was first reported in China has killed 26 people and infected more than 800.

The total number of coronavirus cases in China rose to 830, China's National Health Commission said on Friday. There are at least 16 known cases outside mainland China, which brings the cases worldwide to 846, according to CNBC's tally.

Sometimes referred to as the Wuhan virus, it has been temporarily named the "2019-nCoV" and belongs to a family of viruses known as coronaviruses, which can be transmitted from person to person.

The deadly pneumonia-like disease was first identified on Dec. 31 in the Chinese city of Wuhan in Hubei province. It has since spread beyond Wuhan — which has a population of 11 million — to other major cities including Beijing, Shanghai, Macao, and Hong Kong. Outside mainland China, Thailand, Vietnam, the United States, Taiwan, South Korea, Singapore and Japan have reported cases.

The World Health Organization declined on Thursday to formally designate the new virus as a global health emergency, after postponing its decision the day before. Such a designation would give it the power to set temporary recommendations to coordinate a global health response with its 196 member countries.

Here's a snapshot of the number of known cases and where they are.