. >>> i'm arthel nevadaville. time now for "sunday housecall." >> joining us dr. mark siegel. professor of medicine and author of the inner pulse, unlocking the secret of of sickness and health. >> and dr. samadi. good to see you, doctors. >> hello. >> good to see you. >> we're going to talk about this off the bat. a rare virus sending hundreds of children across the midwest and west to hospitals with severe respiratory infections and breathing problems. doctors describing it as a very unusual situation and saying they don't know what to expect. dr. siegel, what can you tell us about this and how contagious is this? >> first of all, it's now arriving in the northeast. we're seeing cases in connecticut and new york now as well. the northwest, west coast, midwest. it's an enterovirus. it affects about 10 to 15 million people a year. entero means it lives in your st stomach, your gi tract. but this one's different. we haven't seen a lot of cases of it. this one is a respiratory enterovirus, meaning you transmit it in respiratory droplets. what's particularly worry some about it,