when these guidelines were last updated. we've had vaccines since then. more therapeutics. so, if you think about that generation time, the time when you're infected and the time when you're most likely to transmit, if you think about alpha, that is said to be five days. delta, four days. and omicron is thought to be three days. and even if we get a transmission, we have, you know, monoclonal antibodies, we have increasing oral options that are going to be away in days and we are more comfortable with treating covid. let's speak to david edwards — he's an aerosol scientist and a harvard university professor and bioengineer. hejoins us from he joins us from paris. hejoins us from paris. does it make sense, reducing the isolation period from ten days down to five days? thank you very much. i understand the logic. it's important for people to understand that the omicron