The World Health Organisation said on Friday it had increased its assessment of the risk of spread and the risk of impact of Covid-19 to "very high" at the global level. WHO director-general Tedros Adhanom Ghebreyesus said that as "most cases can still be traced to known contacts or clusters of cases" there was still "a chance of containing this virus, if robust action is taken to detect cases early, isolate and care for patients and trace contacts.""
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