Harris: Thanks for taking the time to speak with me, Nina. There are a few background issues I should mention so that our readers understand the context of our conversation. An article in the Hollywood Reporter attracted a tremendous amount of attention because it revealed that some private schools in Los Angeles and Orange County have vaccination rates similar to those of countries in sub-Saharan Africa. This is true of affluent areas in northern California as well, such as Marin County. Then there was an outbreak of measles, a disease that had once been declared eradicated in the US, which came courtesy of a happy congregation of unimmunized people at Disneyland. This story also became national news, and measles has now spread to at least 17 states.