risk if everybody does everything. you can t just rely on one thing. the first is that every adult having anything to do with the school building should be vaccinated. the second thing is, we need to get, obviously, the students vaccinated. where are these parents? why haven t they brought children in for vaccination age 5 and up? they re all eligible. and then wearing masks, good ventilation, doing social distancing to the degree that you can, good hand hygiene and environmental sanitation. if you put each of those things together, you ear in pretty good shape. okay. let s talk now about the new cdc covid-19 isolation guidance. they moved it from ten days to five days. by the way, as we were discussing last hour, this fol follows the science here. if you look at the graph, your transmissibility declines very quickly after that first positive test. the confusion is, not just that time change, but whether you need a test, a negative test to