sure that you're using cites of care for the purposes they're intended. so, please, please do not show up in the emergency room for a covid test if you're mildly ill. if you're sick enough, absolutely, want to care for you in the emergency room setting, but we need to use those tight resources right now to the maximal capacity. >> reporter: her advice, if you have symptoms, act like you have covid, stay at home, isolate, save those testing resources for those who need it. maybe even health care workers who need a test, who need to know if they can come back, instead of being in that emergency room, just to get that test. >> or hopefully have an at-home test you can use to confirm or otherwise. okay, liz, thank you for that. as the covid cases continue to spike, in-person schooling remains in flux. the teachers in chicago, they're refusing to go back to the classroom. and nbc's scott cohn is in san jose, california, where some districts across the state are requiring negative tests and others have teachers staging sick-outs. it's really a broad swath of