South Korea reported its biggest surge in new coronavirus cases on Saturday as concerns grew of a possible epidemic in the United States and the World Health Organization raised its risk alert to its highest level.
The virus has rapidly spread across the world in the past week, causing stock markets to sink to their lowest levels since the 2008 global financial crisis over fears that the disease could wreak havoc on the world economy.
More than 2,900 people have died and over 85,000 have been infected worldwide since it was first detected in the central Chinese city of Wuhan late last year.
The vast majority of infections have been in China but more daily cases are now logged outside the country, with South Korea, Italy and Iran emerging as major hotspots.
South Korea has the most cases outside China, with 3,150 infections as 813 more patients were reported on Saturday – the country's biggest increase to date.
North Korean leader Kim Jong Un warned top party officials of the "serious consequences" of failing to prevent an outbreak on their side of the border.
The impoverished nation, with a weak and ill-equipped healthcare system, has closed its borders to prevent the spread of the disease into its territory.
The virus has also spread to new zones in recent days, reaching nine new countries including Azerbaijan, Mexico and New Zealand, as well as reaching sub-Saharan Africa with Nigeria reporting its first case.
"We have now increased our assessment of the risk of spread and the risk of impact of COVID-19 to very high at global level," WHO chief Tedros Adhanom Ghebreyesus told reporters on Friday.