Scientists at Hong Kong University published research in a medical journal on Saturday that projects as many as 75,815 people in Wuhan, China, may have been infected with Coronavirus, the South China Morning Post reported.

The city of 11 million people has been on virtual lockdown for weeks as China seeks to stem the spread of the deadly virus. The death toll jumped overnight by 46 to 259 people, while the number of confirmed cases in China soared to 11,791. Around two dozen other countries have reported another 137 cases, Reuters reported.

Beijing has criticized Washington’s order barring entry to most foreigners who visited China in the past two weeks as “mean,” but on Saturday, Australia became the latest country to take a similar step. Japan and Singapore have enacted similar measures, according to the Associated Press.

The US is also quarantining those who return from China for two weeks.

Washington’s move came as the seventh case was confirmed in the US, a man in California’s Bay Area.

Other countries, like England, South Korea, Singapore and India, were evacuating hundreds of citizens out of Wuhan. Britain was withdrawing staff from its embassy and consulates in China, Reuters reported.

“In the event that the situation deteriorates further, the ability of the British Embassy and Consulates to provide assistance to British nationals from within China may be limited,” the UK government said in a statement.

The virus’s rapid spread in two months prompted the World Health Organization on Thursday to declare it a global health emergency. The agency is especially concerned about human-to-human transmission outside of China.

“Countries need to get ready for possible importation in order to identify cases as early as possible and in order to be ready for a domestic outbreak control, if that happens,” the WHO representative in Beijing, Gauden Galea, told the AP.

Poorer countries that might not be equipped to respond are a particular concern.