A senior Chinese health official said on Wednesday there was no factual basis to accusations that China did not share data with researchers appointed by the World Health Organization (WHO) to look into the origins of Covid-19.

Following the official publication of the joint study into the origins of Covid-19 by China and the WHO on Tuesday, WHO director-general Tedros Adhanom Ghebreyesus said China had withheld data from international investigators during their visit to Wuhan, where the coronavirus was first identified...