Experts with knowledge of the incident said on Monday that the latest reversal appeared to be a genuine mistake in the agency’s scientific review process, rather than the result of political meddling. Officials said the agency would soon publish revised guidance.
“We are reviewing our process and tightening criteria for review of all guidance and updates before they are posted to the C.D.C. website,” said Jason McDonald, a spokesman for the agency.
Still, the reversal prompted rebukes from even the C.D.C.’s staunchest supporters. “It’s not something that instills a lot of confidence, right?” said Dr. Carlos del Rio, an infectious disease expert at Emory University. “It doesn’t help at all.”
Other scientists said it was hard to understand how a document of such public health importance could have been posted without careful vetting, given how closely the agency’s actions are now scrutinized.