when the cdc announced they were shortening the isolation period from 10 to 5 days. some confusion ensued in the days after. they eventually released more guidance relating a little bit to testing. but it's coming at a time when americans lack for clarity how to live with this virus. now, the -- it's not just the messaging problems that are coming under scrutiny. there are some scientists within the cdc, cnn has learned, who are also frustrated with how the guidance have come together, as walensky has been consulting just a small group of advisers to release this guidance. but in addition to the issues with the cdc, the white house is also grappling with other challenges as well, specifically when it comes to the issue of testing. as we have seen nationwide, the shortages, and access to tests, really have been difficult to find over the course of the past few weeks with covid surging.