Europe has now become the epicentre of a coronavirus pandemic that has claimed 5,000 lives around the world, "a tragic milestone", the World Health Organisation said on Friday.
More than 132,000 cases of the virus have been reported in 123 countries since it emerged in December in the central Chinese city of Wuhan, WHO director-general Tedros Adhanom Ghebreyesus told a virtual news conference.
"Europe has now become the epicentre of the pandemic with more reported cases and deaths than the rest of world combined apart from China," he said in Geneva.
Tedros announced that WHO was launching a coronavirus solidarity response plan. This would to allow people and organisations to contribute to help fund masks, gloves, gowns and goggles for heath workers, as well as diagnostic kits and investment in research and development, including for vaccines.
Social distancing is a "tried and tested method" to slow the spread of a virus but "not a panacea" that will stop transmission, WHO's top emergency expert Dr. Mike Ryan said.
Each sovereign country must decide on its own measures to protect its own population, he said, adding: "But we've also consistently said that blanket travel measures in their own right will do nothing to protect an individual state."
Detection and isolation of infected people as well as tracing their contacts and wider testing must be part of a comprehensive strategy, Ryan said.
"As part of an overall comprehensive strategy, there is a place - particularly inside national borders - for potentially restricting movement between zones, as we've seen in certain places," he said.
"But there is rarely a justification for blanket bans, unless of course the context and the risk defines that."
US President Donald Trump has announced sweeping travel restrictions to prevent people from 26 European countries - except for Britain and Ireland - from travelling to the United States in a bid to limit the virus spread.
A number of other countries in recent days have announced stepped up border checks, and cancelled flights to other countries, in an effort to contain the spread.
Trump on Friday will declare a national emergency over the fast-spreading coronavirus, opening the door to providing more federal aid to fight the disease, according to a source familiar with the declaration.