China has been criticized for withholding raw data and repeatedly delaying a visit by the team of W.H.O. experts. The government in January finally allowed the W.H.O. team to visit the Chinese city of Wuhan, where the first coronavirus cases were detected in late 2019.
At a briefing with more than 100 foreign diplomats from 50 countries on Friday in Beijing, Chinese officials said the government had been transparent.
W.H.O. officials have acknowledged difficulties in compiling the report and say it will be released soon.
“It is, in a way, a painful process to get to the finishing line,” Peter K. Ben Embarek, a food safety scientist with the World Health Organization who is leading the team of experts, said at a news conference on Friday. “But the content is now complete.”