samin sharma of new york's mount sinai hospital.mal clotting can be widespread. >> clotting in the heart, clotting in the lungs, clotting in the kidneys, clotting in the brain artery. >> reporter: those clots can damage the kidneys, leading to dialysis; the brain, causing confusion, seizures or strokes; and the heart, causing an irregular rhythm or a heart attack. you have been doing this about 30 years. are you feeling like a medical student again? >> well, in some ways, yes. >> reporter: this is a new frontier, right? >> that is absolutely a new frontier. i don't even know what will be the other atypical and unusual presentation of covid-19. >> reporter: and that's presenting doctors with a tough challenge: trying to figure out the different ways this virus can attack our bodies, and the various symptoms it can cause, when we seem to be learning new things about it every day. dr. jon lapook, cbs news. >> o'donnell: and coming up next, pets and people stuck together at home-- you could call it an "im-paws-able" situation. and take.