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Pediatric emergency room physician at columbia university medical center, as well as a member of columbia's medical faculty. ladies, thanks so much for being with us. my goodness, if bwe could just get this past this thing. it's just wishful thinking i suppose. i want to ask you though dr. wen about the cdc updating guidelines today. as he i mentioned, they shortened the recommended times people should isolate when they have tested positive for covid-19 from ten days to five days if they don't have symptoms, if they wear a mask around others, for at least five more days. what do you think of t...

Ladies, thanks so much for being with us. my goodness, if we could just get this past this thing. it's just wishful thinking i suppose. i want to ask you though dr. wen about the cdc updating guidelines today. as he i mentioned, they shortened the recommended times people should isolate when they have tested positive for covid-19 from ten days to five days if they don't have symptoms, if they wear a mask around others, for at least five more days. what do you think of that decision? as shimon was just saying at la guardia airport, might help flight crews who are kind of grounded right now. >> ...

Ross elementary school in northeast houston. none of the children, two boys and a girl, appear to be seriously hurt. we're told they were conscious, sitting upright on stretchers, when they were loaded into ambulances. the school is on lockdown. and several parents, of course, also rushed to the scene of this shooting. in other news, researchers released new guidelines today, outlining three stages to treat and study alzheimer's. in the preclinical alzheimer's disease stage, symptoms are not evident. researchers look at blood, spinal fluid and neurological imaging, searching for biological c...