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|A man, who visited Beijing recently, is tested for the coronavirus in Nanjing in China's eastern Jiangsu province. (STR/AFP)|
As lockdown restrictions ease and countries in Europe lifted their borders, the WHO warned countries to stay on alert for a possible resurgence of COVID-19 infections.
The UN health agency said it understood no new deaths have been reported thus far in the Chinese capital but added that given Beijing's size and connectivity, the outbreak was a cause for concern.
"Even in countries that have demonstrated the ability to suppress transmission, countries must stay alert to the possibility of resurgence," WHO director-general Tedros Adhanom Ghebreyesus told a virtual press conference.
"Last week, China reported a new cluster of cases in Beijing, after more than 50 days without a case in that city. More than 100 cases have now been confirmed.
"The origin and extent of the outbreak are being investigated."
The virus emerged in Wuhan in China in late 2019. It since drove local transmission down to near-zero as the crisis hammered the rest of the world.
Maria Van Kerkhove, the WHO's COVID-19 technical lead, told the news conference in Geneva: "My understanding is that there are no deaths associated so far" with the Beijing outbreak.
WHO emergencies director Mike Ryan said that countries which have implemented an immediate and comprehensive spread of measures have generally been able to contain new clusters.
"However, Beijing is a large city and a very dynamic and connected city, so there is always a concern," he said.
"And I think you can see that level of concern in the response of the Chinese authorities, so we are tracking that very closely."
He said the WHO had offered assistance and support to the Chinese authorities leading the probe, and may reinforce its own team in Beijing in the coming days as the investigation grows.
"A cluster like this is a concern and it needs to be investigated and controlled - and that is exactly what the Chinese authorities are doing," said Ryan.
The novel coronavirus has killed at least 433,000 people and infected more than 7.9 million since it first emerged in China last December, according to a tally from official sources compiled by AFP.
Tedros said it had taken more than two months for the first 100,000 cases to be reported - but for the past two weeks, more than 100,000 cases have been been reported to the WHO almost every day.
Nearly 75 per cent of recent cases come from 10 countries, he said, mostly in the Americas and South Asia.
However, there were increasing numbers of cases in Africa, eastern Europe, central Asia and the Middle East, he added.