The Iranian president suggested his government hopes to overcome COVID-19 through achieving herd immunity, while other officials offered different explanations for the high infection numbers.
Iraqi Prime Minister Mustafa al-Kadhemi's scheduled visit to Saudi Arabia has been postponed following the monarch's hospitalisation.
The pandemic has driven up food prices and triggered displacement as Yemenis flee areas seeing spikes in infections and military clashes.
The organisation urged governments to 'strengthen healthcare systems' as the region records over a million coronavirus infections and more than 20,000 deaths.
The Houthis have been criticised for under-reporting coronavirus infections in the city and failing to make precautionary measures mandatory.
The coronavirus pandemic has claimed the lives of more than 50 medical personnel, further straining the collapsing healthcare system.
The Houthis say faulty test-kits are responsible for the spread of the coronavirus, but WHO and Yemeni officials dismiss these claims.
Under Yemen's dilapidated health system, millions are at risk of being infected with coronavirus and other diseases, the country's top health official said.
Authorities suspended the umrah, but have yet to announce whether they will proceed with this year's hajj, scheduled for the end of July.
Yemeni officials say there is a continuing need for the UN and donor countries to support Yemen's health sector as it battles COVID-19.