The head of the World Health Organization (WHO) has said Covid-19 is easily the most severe global health emergency it has ever declared.
Dr Tedros Adhanom Ghebreyesus said he would reconvene the WHO's emergency committee this week to review its assessment of the pandemic.
There have been five other global health emergencies: Ebola (two outbreaks), Zika, polio and swine flu.
More than 16m cases of Covid-19 have been reported since January.
"When I declared a public health emergency of international concern on 30 January… there were less than 100 cases outside of China, and no deaths," Dr Tedros said.
"Covid-19 has changed our world. It has brought people, communities and nations together, and driven them apart."
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"This is the sixth time a global health emergency has been declared under the international health regulations, but it's easily the most severe. [More than] 16m cases have now been reported to WHO and more than 640,000 deaths, and the pandemic continues to accelerate.
"In the past six weeks, the total number of cases has roughly doubled," he added.
Although the world had made a huge effort in fighting the virus, there remained "a long hard road ahead of us", he added.
In other developments:
- US President Donald Trump's national security adviser, Robert O'Brien, has tested positive for coronavirus. He is the highest-ranking official in the administration known to have tested positive
- Spain insists recent outbreaks of new cases were isolated and the country is safe for tourists to visit, after the UK introduced new measures requiring visitors from Spain to quarantine for 14 days
- Vietnam has closed the coastal city of Da Nang to tourists, after 15 new locally transmitted coronavirus cases were recorded there – the first in the country since April
- US biotech company Moderna has begun the final phase of clinical trials for a potential Covid-19 vaccine. Some 30,000 volunteers are taking part in the third and last phase of testing before the vaccine can be submitted to a regulatory authority for evaluation and possible approval
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