The officials asked not to be identified because the report is secret and declined to detail its contents. But the thrust, they said, is that China's public reporting on cases and deaths is intentionally incomplete. Two of the officials said the report concludes that China's numbers are fake.
Stacks of thousands of urns outside funeral homes in Hubei province have driven public doubt in Beijing's reporting.
Deborah Birx, the State Department immunologist advising the White House on its response to the outbreak, said Tuesday that China's public reporting influenced assumptions elsewhere in the world about the nature of the virus.
"The medical community made -- interpreted the Chinese data as: This was serious, but smaller than anyone expected," she said at a news conference on Tuesday. "Because I think probably we were missing a significant amount of the data, now that what we see happened to Italy and see what happened to Spain."