Nigeria, April 22 -- After an international mission to China turned up more questions than answers about the pandemic origins, the WHO is evaluating how to move forward through a diplomatic quagmire to solve the mystery.

Determining how the virus that causes COVID-19 first began spreading among humans is seen as vital to preventing future outbreaks.

But a long-delayed report, drafted by the team of international experts sent to Wuhan at the start of the year and their Chinese counterparts, drew no firm conclusions and called for more investigation.

The World Health Organisation's emergency committee this week urged the "rapid implementation" of the report recommendations for phase two probes.

But while the WHO and countries worldwide ...