dose. then there are some individuals who may have high-risk exposure who also have chronic medical conditions that make them immunocompromised in some way. may not formally meet the criteria by the cdc, but i think they should talk to their doctors. the reason i talk about options is so much of clinical medicine is about the nuance. i don't think that people who are healthy, have no chronic underlying medical conditions should be going out to get a booster dose. but if you have some underlying medical conditions that may make you immunocompromised in some way, i think it's a good idea to talk to your doctors. >> dr. wen, good to see you. thank you for all that information and the added advice. appreciate it. >> thank you. still to come in the newsroom, unraveling by the day. as the situation in afghanistan becomes more dire, staff at the u.s. embassy there are now being told to destroy sensitive documents. plus, the debate over masks and vaccines in schools is boiling over. the president of the nation's largest teachers union joining me live.