dr. anthony fousi is the director of infectious diseases at if nih. him testifying today in the house. with other leading medical experts about this newly controversial issue of vaccines that should never be controversial at all. he's our top expert on infectious diseases and joins us tonight. thank you for taking time to be with us tonight. >> good to be with you. >> you obviously come at this not from a political perspective but a scientific perspective. i have to ask if you are worried about the scientific and public health consequences of this becoming a politically controversial issue. >> well, i certainly hope that it doesn't, rachel because this is something that is a scientific public health issue. we have this outbreak currently. this is not something that we should take rightly. measles can be a serious disease, and it's really unfortunate when you have a highly contagious infectious disease, a highly effective vaccine, with really a very safe vaccine, and yet children are not being vaccinated. it does not make any sense. i've heard people s