Medical staff process a swab sample collected from a resident of an area under the enhanced movement control order in Petaling Jaya, Selangor, Malaysia, May 10, 2020. (Photo by Chong Voon Chung/Xinhua)

"We consider it not a proper time, being somewhere in the middle of a severe crisis, an unprecedented crisis, to try to blame everything on the international health organization (the WHO) or, the next day, on China," Peskov said.

Britain has also seen little evidence that the coronavirus is man-made, British Health Minister Matt Hancock was quoted by Reuters as saying.

The novel coronavirus spread extensively around the world since late 2019 and the single "Patient Zeroes" is absent in most countries, the latest study by the University College London Genetics Institute has shown.

"The results add to a growing body of evidence that SARS-CoV-2 (novel coronavirus) viruses share a common ancestor from late 2019, suggesting that this was when the virus jumped from a previous animal host, into people," the university said in a statement on Wednesday.

"This means it is most unlikely the virus causing COVID-19 was in human circulation for long before it was first detected," it added.