and then all of a sudden, the phone started to ring, and cdc and hhs and everybody on the phone, thefectious diseases is here in san francisco promoting his new book, on call. >> doctor fauci has spent decades advising national leaders on how to contain outbreaks, including the hiv aids epidemic. he remembers the moment he learned about it. >> a memoir landed on my desk from the cdc, which was a case of five. curiously, all otherwise previously healthy young gay men from l.a. with a very strange pneumonia, pneumocystis pneumonia. >> for those at the event, seeing him was about honoring his years of service is to me, he did a good job, you know, and i thank him for his service. >> you know, and i really appreciate what he did, you know, to get this country back in order again, especially honoring him during pride month for his work on hiv. >> you know, as a child, you learned about the aids crisis. you know, his impact in reading more about him, of what he's been able to bring to that community. >> doctor fauci even says the work scientists did on hiv led to the development of the cov