China faced deepening isolation over its coronavirus epidemic on Sunday, with the United States and Australia leading a growing list of nations to impose extraordinary Chinese travel bans.

With Britain, Russia and Sweden among the countries confirming their first infections, the virus has now spread to more than two dozen nations, sending governments scurrying to limit their exposure.

China toughened its own quarantine measures at the center of the outbreak in Hubei province, a day after the United States temporarily barred entry to foreigners who had been in China within the past two weeks.

“Foreign nationals, other than immediate family of U.S. citizens and permanent residents … will be denied entry into the United States,” Health Secretary Alex Azar said.

Australia said it was barring entry to non-citizens arriving from China, while Australian citizens who had traveled there would be required to go into “self-isolation” for two weeks.

Vietnam suspended all flights from mainland China effective Saturday, while Russia announced it would halt visa-free tourism for Chinese nationals and stop issuing them work visas.

Similar expansive restrictions have been announced by countries including Italy, Singapore, and China’s northern neighbor Mongolia.

The United States, Japan, Britain, Germany and other nations had already advised their citizens not to travel to China.

Thousands of Hong Kong medical workers voted to commence a four-day strike from Monday to push the government to close its border with mainland China to stop the virus, which has already spread to the financial hub.

Britain said Saturday it was temporarily withdrawing some diplomatic staff and their families from across China, a day after the U.S. State Department ordered embassy employees to send home family members under the age of 21.

Beijing insists it can contain the virus and called Washington’s advice against travel to China “unkind.”

“Certainly it is not a gesture of goodwill,” foreign ministry spokeswoman Hua Chunying said.

The U.S. emergency declaration also requires Americans returning from Hubei province to be placed in mandatory 14-day quarantine, and health screening for American citizens coming from other parts of China.

The virus emerged in early December and has been traced to a market in Hubei’s capital Wuhan that sold wild animals.

It spread globally on the wings of a Lunar New Year holiday rush that sees hundreds of millions of Chinese people travel domestically and overseas.

The economic fallout continued Saturday as Apple announced that all its China stores would be closed until next Sunday.

China’s central bank said it would offer financial support to businesses hit by the public health emergency.

With public anger mounting in China, Wuhan’s top official admitted late Friday that authorities there had acted too slowly.

“If strict control measures had been taken earlier the result would have been better than now,” said Ma Guoqiang, the Communist Party chief for Wuhan.

Wuhan officials have been criticized online for withholding information about the outbreak until late December despite knowing of it weeks earlier.

China finally lurched into action a week ago, effectively quarantining whole cities in Hubei and tens of millions of people.

Unprecedented safeguards imposed nationwide include postponing the return to school, cutting bus and train routes, and tightening health screening on travelers nationwide.

On Saturday, authorities in Hubei extended the new year holiday until Feb. 13 and announced a suspension of marriage registrations from Monday to discourage public gatherings.

The city of Huanggang, east of Wuhan, said only one member of each household would be permitted to leave the house every two days to buy necessities.

But the toll keeps mounting at an ever-increasing pace, with far more infections — though fewer deaths — than the outbreak of severe acute respiratory syndrome in 2002 and 2003. SARS, which is caused by a pathogen similar to the new coronavirus and also originated in China, killed 774 people worldwide — most of them in mainland China and Hong Kong.

The World Health Organization declared the outbreak a global emergency on Thursday but later warned that closing borders was probably ineffective in halting transmission and could accelerate the virus’s spread.

But authorities around the world pressed ahead with preventive measures.

Thai health officials on Friday said a taxi driver became the kingdom’s first case of human-to-human transmission.

Thailand joins China, Vietnam, Germany, Japan, France and the United States with confirmed domestic infections.

The health crisis has dented China’s international image and put Chinese nationals in difficult positions abroad, with complaints of racism.

More than 40,000 workers at a vast Chinese-controlled industrial park in Indonesia — which also employs 5,000 staff from China — were put under quarantine, the facility said on Friday.

On the same day, China flew overseas Hubei residents back to the center of the outbreak in Wuhan on chartered planes from Thailand and Malaysia, citing “practical difficulties” the passengers had encountered overseas.

Countries have scrambled to evacuate their nationals from Wuhan, with hundreds of US, Japanese, British, French, German, South Korean, Indian, Bangladeshi and Mongolian citizens evacuated so far, and more governments planning airlifts.

RELATED PHOTOS Students and family members of Pakistani students living in the Chinese city of Wuhan demand they be brought home in Islamabad on Saturday. | AFP-JIJI