Isn't the actual protocol 2 weeks since infection?
The science supports a 2 week quarantine, which is why that's what they said initially. However everyone in the CDC who at any point may have wanted to control a disease from a central location was either forced to leave or compromise with the political reality that the US was never going to implement that and neither were the employers who run most of our society, and the five day thing was rolled out instead. Now the new guidelines are here allegedly because nobody was following the previous ones, but of course they've neglected to answer the question of how they're going to get us to follow the new ones.