" I know you're on my side," an immunologist once remarked to me as we discussed the politics of vaccination. I did not agree with him, but only because I was uncomfortable with both sides, as I had seen them delineated. The debate over vaccination tends to be described with what the philosopher of science Donna Haraway would call " troubling dualisms." These dualisms pit science against nature, public against private, truth against imagination, self against other, thought against emotion, and man against woman. "