I think that people's resistance to vaccination isn't going to disappear until we address some of the nonmedical reasons for that resistance and people's discomfort and distrust of the government. That's bigger than what most medical professionals can handle.

On the pro-vaccine side - and not everyone does this, but I saw it enough for it to make me really uncomfortable - is a tendency to accuse people who are wary of vaccination of being stupid and not understanding science.

Nigeria and Pakistan are two countries that have had a lot of trouble with polio. And part of the reason is that there's a lot of political unrest, and people really distrust what the government is doing. That has an effect on people's health, and it has an effect on the health of children.

One of the mysteries of hep B immunization is that vaccinating only 'high risk' groups, which was the original public health strategy, did not bring down rates of infection.