profit." >> they all have this guy paul offit. you guys know him? ( audience boos ) and he is the poster child for the term "biostitute." he does not disclose the millions of dollars... >> narrator: for such critics, the fact that vaccines have made offit rich is enough to discount what he is saying. but offit, a prolific author, makes no apologies. >> i'm the co-inventor of a rotavirus vaccine, a vaccine that i made in collaboration with merck. and it's a vaccine which has caused a dramatic decrease in this country in hospitalization and has caused already a dramatic decrease in hospitalization and death in some countries in the developing world. i'm enormously proud of that. i would argue that i have an expertise in rotaviruses and... >> you also financially benefit from that vaccine. >> it... it's... i know this isn't going to... going to sell, but it doesn't matter. it doesn't matter whether i financially have benefited or not. the only thing that mattered is... is... is... is, did the vaccine that we created at children's hospital of philadelphi