A World Health Organisation-led team investigating the origins of the Covid-19 pandemic visited the Center for Disease Control and Prevention in China's central region of Hubei, where the outbreak emerged in late 2019, Reuters reports.

The group of independent experts spent about 4-1/2 hours on its longest site visit since completing two weeks of quarantine on Thursday, and did not speak to waiting journalists.

The WHO, which has sought to manage expectations for the mission, has said its members would be limited to visits organised by their Chinese hosts and have no contact with community members, because of health curbs.