dr. neville started to address the hot teams mission and by reconstructing service. the hot team is a group who would address everything about the homeless including medical intervention, when someone was ill on the streets. intervention case management and transportation to shelters and health care and transition to supportive housing to stabilization rooms. under the new reconstruction, the hot team now focuses on the highest users of emergency services. and the people who are the most vulnerable. this is only a subset of the homeless population as a whole. important to keep on training shelters workers to help them make the distinction. james gump from white house and the blind and visually impaired talked about repeating out volunteer youth corp partnered with the red cross to develop a hand book for people who are blind or low vision. this is enhanced information for the visually impaired. what was lovely about this new handbook is that it's printed in a format that has language print and brailled text. tera connor from the department of public health together t

neville. joining us is chief of robotic surgery, dr. samadi. >> and dr. marc siegel. he's a columnist at "usa today". >> congratulations. >> well, we are going to start today with a new study showing that americans have fewer types of gut bacteria than people in less developed countries. dr. samadi, it seems like this makes sense. what sort of gut bacteria are you talking about and why do we have less of it? >> we've spoken about this before but it's a very, very important thing. we have in our guts about 100 trillion, 100 trillion bacterias and some people have said that almost 90% of us are bacteria and 10% is human. so this co-existence in our gut is very important. a lot of good bacteria and bad bacteria. that balance, arthel, is very important. once you change that is when we start having a lot of chronic disease. diabetes, colitis. they looked at the u.s. population and compared it to people in new guinea that haven't been exposed to all of the antibiotics wewe have. what they find is the diversity of bacterias in those tribes are a lot more than us. we're not -

neville. joining us is chief of robotic surgery, dr. samadi. >> and dr. marc siegel.olumnist at "usa today". >> congratulations. >> well we are going to start today with a new study showing that americans have fewer types of

neville. it's time for sunday house call. >> joining us professor marc siegel. >> and dr. david samadi from lenox hill hospital. good to see you, docs. >> happy passover. >> same to you. we start with major advances in cancer research this month. a new

neville. it's time for sunday house call. >> joining us, professor marc siegel. >> and dr. david samadi from lenox hill hospital. good to see you, docs. >> happy passover. >> same to you. we start with major advances in cancer research this month. a new treatment was announced for melanoma that works by quinn jebtsing tumors with viruses that are wired to destroy them. how does this work? >> this is very exciting. we've been talking about viruses to kill cancer. but now they're finally starting to make head way. fighting cancer is like a war. but we're getting to the point now where we have guided missiles, where they go right into the cancer cells. and the biggest problem that had to be overcome was to teach the body that these cancer cells are foreign. because before cancer hid in the body. and melanoma is not being attacked by the immune system. they're taking a herpes, a cold sore virus and getting it to be pecked up by the melanoma cell. once it's in the cell, the immune system sees it and says there's that invader and comes marching in with t-cells to destroy the melanoma. so you have a twofer. it's still