China

A fifth U.S. case of coronavirus has been confirmed, this one in Arizona's Maricopa County. A statement released on Sunday from the Arizona Department of Health Services described the patient as "a member of the Arizona State University community who does not live in university housing."

Updated at 3:32 p.m. ET

Health officials in two California counties have reported over the weekend two new cases of Wuhan coronavirus in the state, bringing the total number of cases in the U.S. to four.

The Orange County Health Care Agency reported Saturday that a man in his 50s tested positive for the infectious disease and is currently being treated in isolation at a local hospital.

Updated at 6:34 p.m. ET

A second person in the United States has been infected with a dangerous new coronavirus that is spreading in China, U.S. health officials announced Friday.

A woman in her 60s got infected with the virus while traveling in the Wuhan, China, area in late December and became ill after returning home to Chicago Jan. 13, according to officials from the federal Centers for Disease Control and Prevention and the Illinois and Chicago health departments.

Updated at 6:35 p.m. ET

Construction workers in China were scrambling to build a makeshift quarantine and treatment facility on the outskirts of Wuhan, the epicenter of a rapidly spreading new viral pneumonia that has killed 41 people and infected moe than 1,000 others in the country.

Updated Jan. 26, 12 p.m. ET

A new strain of virus that appears to have originated in China is spreading rapidly and crossing borders. There are more than 2,000 confirmed cases worldwide and 56 reported deaths as of Jan. 26.

Here's what we know so far about this virus, as reported by NPR's daily science podcast Short Wave.

What kind of disease is this?

Updated at 9:50 p.m. ET

Wuhan's public health authorities say they are in a "state of war" as they quarantine the Chinese city in an attempt to halt the spread of a never-before-seen strain of coronavirus.

"Strictly implement emergency response requirements, enter into a state of war and implement wartime measures to resolutely curb the spread of this epidemic," urged a committee of Wuhan's top officials. "Homes must be segregated, neighbors must be watched."

A new strain of coronavirus — named 2019-nCoV — has been discovered in China. Viruses in the coronavirus category can cause fever, breathing difficulties, pneumonia and diarrhea. Some are potentially fatal. Others can cause the relatively mild common cold.

Here is a look at the most well-known coronaviruses: what they have in common and how they differ.

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Updated Jan. 25, 2:46 p.m. ET

Chinese state media are reporting that authorities in the city of Wuhan are planning to suspend bus, subway, ferry and long-distance passenger transport. They also say that all flights and trains departing from Wuhan will be temporarily canceled in a bid to reduce spread of the new virus.

New information is being reported about the new coronavirus that emerged in China in December and causes respiratory symptoms such as pneumonia — heightening concerns about its potential threat to humans.

On Monday, Chinese authorities reported that the total caseload has risen to over 200, roughly tripling the previous number. In addition, authorities in Wuhan, where the virus was first reported, confirmed a third death but did not release details except to say that the three victims, all men, had prior illnesses.

Updated at 7:50 a.m. ET Tuesday

The extradition hearing for Meng Wanzhou, the chief financial officer for the Chinese telecommunications giant Huawei, began Monday in Vancouver, British Columbia. American officials want Meng sent to the U.S. to face federal fraud charges.