US Secretary of State Antony Blinken stressed the need for cooperation and transparency over the origins of Covid-19 in a call with Chinese counterpart Yang Jiechi on Friday and raised other contentious topics, including China's treatment of Uyghur Muslims, Hong Kong and Taiwan.

Yang, China's top diplomat, expressed to Blinken Beijing's serious concern that some people in the United States were spreading the "absurd story" about the coronavirus escaping from a Wuhan laboratory, Chinese state media said.