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".
Striking an increasingly exasperated tone, the WHO said the world would look back on itself with shame if it knowingly chose to leave the world's weakest at the mercy of the pandemic.
"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.
GENEVA: The heads of the global health, IP and trade agencies on Thursday announced a joint platform to help countries plug the gaps in accessing Covid-19 vaccines, treatments and technologies.
"Furthermore, Covid-19 testing and vaccination has been severely impacted," he said, cautioning that "this creates health risks for the world as a whole."