Instead, additional reference documents will be provided, Redfield told ABC's "Good Morning America."
"Our guidelines are our guidelines, but we are going to provide additional reference documents to aid basically communities in trying to open K-through-12s," Redfield said. "It's not a revision of the guidelines; it's just to provide additional information to help schools be able to use the guidance we put forward."
During a press briefing on Wednesday, Vice President Mike Pence said the CDC would issue new guidance on reopening schools next week. Both he and Redfield said the agency's recommendations should not be viewed as a barrier to returning children to classrooms.
"Right now, we're continuing to work with the local jurisdictions to how they want to take the portfolio of guidance that we've given to make them practical for their schools to reopen," he said.
Given such advice, it was not clear how the CDC guidelines could be eased without raising the risk that the return to school could cause infections. The current guidelines say the highest risk of Covid-19 transmission could come with full-size classes, a lack of social distancing and with children mixing between lessons.
This story is breaking and will be updated.