Health and Science

Coronavirus outbreak declared global health emergency, US confirms first human transmission

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HHS Secretary Alex Azar on preventing coronavirus spread in the US

The coverage on this live blog has ended — but for up-to-the-minute coverage on the coronavirus, visit the live blog from CNBC's Asia-Pacific team.

All times below are in Eastern time.

5:35 pm: Hubei province reports 42 additional deaths

The Hubei Province Health Commission on Thursday reported an additional 42 deaths along with an additional 1,220 confirmed cases of coronavirus in the region as of Jan. 30. That brings the total to 204 deaths and 5,806 cases in the province.

5:23 pm: Trump says coronavirus outbreak is 'all under control' and a 'very small problem' in US

President Donald Trump said the U.S. government was working closely with China to contain the outbreak, predicting "a very good ending" for the United States. "We are working very closely with China and other countries, and we think it's going to have a very good ending for us, that I can assure you," Trump said Thursday while visiting a manufacturing plant for auto supplier Dana in Warren, Mich., a suburb of Detroit. Trump said U.S. officials believe "we have it all under control," adding that it's a "very small problem in this country."

4:19 pm: Coronavirus could hurt sales in first quarter, Oreo-maker Mondelez says

Mondelez Chief Executive Dirk Van de Put said he expects first-quarter revenue to be affected by the spread of the coronavirus. The company has already closed two factories near the epicenter of the outbreak for 10 days to combat the risk of infection from the virus. "Up to the moment that the media started to talk a lot about the coronavirus, we were selling out quite well," Van de Put told CNBC.

3:52 pm: Pilots union files suit to halt American Airlines flights to China

The union that represents American Airlines' pilots said Thursday it's suing American Airlines to halt service to China amid the coronavirus outbreak, which has killed more than 170 people in China and infected more than 8,000 around the world. The Allied Pilots Association represents "15,000 professional pilots who fly for American Airlines," according to its site. The suit seeks a temporary restraining order that, the APA said, would halt all American Airlines service between the U.S. and China.

3:00 pm: US State Department authorizes departure of staff and families in China

The U.S. State Department has placed all non-emergency staff and their families on "authorized departure" from China. While this is not an order for personnel to leave the country, it means they are permitted to leave the country amid the coronavirus outbreak. It will affect the U.S. embassy in Beijing and the Consulates General in Chengdu, Guangzhou, Shanghai, and Shenyang, a State Department spokesperson said, all of which will continue to provide consular services, as resources allow.

2:43 pm: WHO declares global health emergency

The World Health Organization said the fast-spreading coronavirus that's infected more than 8,200 across the world is a global health emergency — a rare designation that helps the international agency mobilize financial and political support to contain the outbreak.

2:30 pm: World Health Organization officials hold press conference on outbreak

WHO is holding its fourth news briefing to announce whether the coronavirus outbreak is a global health emergency. WHO was expected last week to make its decision, but officials said they postponed their announcement to gather more data. WHO doesn't enact the emergencies lightly, health experts say. The last time WHO declared a global health emergency was in 2019 for the Ebola outbreak in eastern Congo that killed more than 2,000 people. Watch the announcement here.

12:37 pm: First human-to-human transmission of coronavirus confirmed in US

The Centers for Disease Control and Prevention and Illinois public health officials confirmed Thursday the nation's first person-to-person transmission of the coronavirus. The new patient is the spouse of the Chicago woman who brought the infection back from Wuhan, China, the epicenter of the outbreak, Illinois health officials said during a CDC press briefing. The transmission makes the U.S. at least the fifth country where the infection is now spreading through human-to-human contact.

11:20 am: Economists say coronavirus could hit the US economy

Coming off the slowest year of growth in three years, the U.S. economy in the first quarter of 2020 is expected to slow down even more due to the impact of Boeing and now the potential wild card of the coronavirus. The virus has already hit the Chinese economy, as cities close and people isolate themselves in their homes. "It's going to have a hit on Chinese spending," Barclays U.S. economist Jonathan Millar said. "We may see more of it in the U.S. but we just don't know at this point. It's very uncertain."

10:03 am: No 'public health options off the table' to protect the American public, HHS Alex Azar says

Health and Human Services Secretary Alex Azar told CNBC on Thursday the administration will not take "any public health options off the table" to protect Americans from the coronavirus, which has infected five U.S. citizens. He added that the risk of infection remains low for the American public and that U.S. health officials are taking all necessary precautions.

9:30 am: Coronavirus cases top 8,200 — surpassing 2003 SARS outbreak in less than a month

More than 8,200 coronavirus cases have now been confirmed across the world, outpacing the total number of infections over the nine-month SARS outbreak in less than a month. As of Thursday morning, there were 8,123 confirmed cases in mainland China alone, according to Chinese state media, and more than 100 cases elsewhere around the world. The new virus first emerged in Wuhan, China on Dec. 31. The deadly SARS virus, by comparison infected a total of 8,098 people globally from Nov. 1, 2002, through July 31, 2003, according to the World Health Organization.

9:20 am: Wilbur Ross says coronavirus could bring jobs, manufacturing back to the US

Commerce Secretary Wilbur Ross said the coronavirus could have a positive impact on the U.S. economy. "I don't want to talk about a victory lap over a very unfortunate, very malignant disease," Ross told Fox Business Network. "But the fact is, it does give businesses another thing to consider when they go through their review of their supply chain."

I think it will help to accelerate the return of jobs to North America," he said. "Some to the U.S., some to Mexico as well."

8:15 am: Cruise ship holds 6,000 passengers near Italy

Costa Cruises is holding 6,000 passengers aboard the Costa Smeralda near Italy after a Chinese woman came down with a fever, raising concern that she may have the virus, Italian news agency Agenzia Nazionale Stampa Associata reported. The cruise line Costa Cruises said in a statement that it is holding the 54-year-old woman from Macao in isolation along with her travel companion. "The Health Authority has been immediately notified and is now on board to conduct all the pertinent measures," the company said. "It is our utmost priority to ensure the health and safety of passengers and crew."

7:48 am: Russia closes border with China

Russia plans to close its border with China to prevent the spread of the coronavirus, according to the country's state media. "A corresponding instruction was signed today. Work on it is already in progress. We will inform all those concerned properly about the measures to close the border in the Far Eastern region and other steps the government has taken (to prevent the spread of coronavirus in Russia)," Russian Prime Minister Mikhail Mishustin told the TASS news agency.

7 am: Outbreak reaches nearly 8,000 with 170 deaths in China

The total number of cases reached more than 7,900 worldwide with 170 deaths in China, Chinese and international health authorities said. The majority of cases are in mainland China, with at least 7,801 cases, exceeding the total number of SARS cases in that country during the 2003 epidemic. At least 101 other cases have been reported across more than a dozen countries across the globe, including the U.S.

5:46 am: US State Department says more flights from Wuhan are scheduled for Monday

More evacuation flights from the city of Wuhan for U.S. citizens will take place Monday, the State Department said. Reuters reported that those on the flights would be subject to screenings and monitoring requirements.

5:27 am: India confirms first case of the coronavirus

India has officially confirmed that at least one case of the coronavirus has reached the country. Indian health officials said the patient is a student at Wuhan University in China and has been isolated in a hospital in the southwestern state of Kerala. The statement said the person is "stable and being closely monitored."

To see last night's up-to-the minute coverage on the coronavirus, visit the live blog from CNBC's Asia-Pacific team.

—CNBC's Weizhen Tan, Evelyn Cheng, Christine Wang and Reuters contributed to this report.