The worst could be still to come in the Covid-19 pandemic, the has warned, six months on from when the outbreak began.
WHO head Tedros Adhanom Ghebreyesus said the virus would infect many more people if governments did not start to implement the right policies. His message remained "Test, Trace, Isolate and Quarantine", he said.
More than 10m cases have been recorded worldwide since coronavirus emerged in China late last year.
The number of patients who died is now above 500,000. Half the world's cases have been in the US and Europe but Covid-19 is rapidly growing in the Americas, BBC reported.
The virus is also affecting South Asia and Africa, where it is not expected to peak until the end of July.
Dr Tedros told a virtual briefing on Monday: "We all want this to be over. We all want to get on with our lives. But the hard reality is this is not even close to being over.
"Although many countries have made some progress, globally the pandemic is actually speeding up."
What are the worst-affected countries?
The US has reported more than 2.5 million cases and about 126,000 deaths with Covid-19 so far - more than any other nation.
US states that emerged from lockdown in recent weeks - notably in the south - have been reporting sharp increases in new infections in recent weeks.
The spike has led officials in Texas, Florida and other states to tighten restrictions on business again.
The country with the second-highest number of recorded cases is Brazil, with a total of 1.3 million, and deaths in excess of 57,000.
On Monday a state of emergency was declared in the capital Brasilia, following a surge there.