"It's extremely likely that the people who have never been exposed to a human who has leprosy, it's very likely they got leprosy from exposure to an armadillo."

"When I was a child, there were not that many vaccines. I was vaccinated for polio. I actually got measles as a child. I got pertussis, whooping cough. I remember that very well."

"Antibiotics are a very serious public health problem for us, and it's getting worse. Resistant microbes outstrip new antibiotics. It's an ongoing problem. It's not like we can fix it, and it's over. We have to fight continued resistance with a continual pipeline of new antibiotics and continue with the perpetual challenge."

"When we can get the incidence of HIV down enough to turn the trajectory of the pandemic, it will assume a momentum of its own in diminishing HIV."

"Fashion is an expression of a time, of a place, of history. It's putting things into context."

"When great changes occur in history, when great principles are involved, as a rule the majority are wrong."

"When we really delve into the reasons for why we can't let something go, there are only two: an attachment to the past or a fear for the future."

"I loved history because to me, history was like watching a movie."