The pledge adds to a previous agreement to provide 30 million doses and $1 billion to COVAX programme, overseen by the GAVI alliance and the World Health Organization
The WHO said the variant has mutations that indicate a risk of resistance to vaccines and stressed that further studies were needed to better understand it
Global demand for medical oxygen is currently more than a dozen times greater than before the pandemic, the document says, but many countries are struggling to access sufficient supplies
In a closed-door briefing to members states, WHO chief Tedros Adhanom Ghebreyesus said one priority in the probe should be "audits of relevant laboratories and research institutions operating in the area of the initial human cases identified in December 2019".
"It's not hesitancy. It's lack of vaccines. And the situation in many low-income countries, especially Africa, it's very worrisome," Tedros Adhanom Ghebreyesus said.