Good questions. My non-expert understanding of the situation is: (1) There are no great tests for it. (For women, pap smears can detect pre-cancerous growths,

Good questions. My non-expert understanding of the situation is: (1) There are no great tests for it. (For women, pap smears can detect pre-cancerous growths, but don't generally test asymptomatic infection or identify the strain, I think. And there is no available test for men. More specialized testing does exist, and is used in medical studies, but is not available to the public. I'm not sure of their cost or accuracy.) (2) Vaccinations are expensive. (I think on the order of a few hundred dollars, not even counting patient time.)