Many hard-hit countries are easing lockdowns put in place to slow the spread of the coronavirus while making extensive alterations to work and social life that could last for a year or more until a vaccine is available.
Almost a quarter of the known global deaths have occurred in the US- nearly 129 000.
In some countries with limited testing capabilities, case numbers reflect a small proportion of total infections. Roughly half of people reported to have been infected are known to have recovered.
Countries including China, New Zealand and Australia have experienced new outbreaks in the past month, despite largely quashing local transmission.
"Nearly 5 500 patients in 39 countries have so far been recruited into the Solidarity trial," he told a news briefing, referring to clinical studies the UN agency is conducting.
Earlier this month, it stopped the arm testing hydroxychloroquine, after studies indicated it showed no benefit in those who have the disease, but more work is still needed to see whether it may be effective as a preventative medicine.
Saudi Arabia passed the grim milestone of 200 000 confirmed novel coronavirus cases, the health ministry said Friday, weeks ahead of an annual hajj pilgrimage drastically cut back because of the pandemic, AFP reports.
In 2019, the rite attracted over 2.5 million Muslim pilgrims from around the world.
It has yet to restore international air links.
Recovered Covid-19 patients donate plasma for treatment in Argentina
To donate, a person has to be well for at least 14 days and test negative twice for coronavirus.