You dont have to vaccinate every man, woman and child in the country if you have a couple of cases of smallpox cropping up.
Anthony S. FauciAn AIDS-free generation would mean that virtually no child is born with HIV; that, as those children grow up, their risk of becoming infected is far lower than it is today; and that those who become infected can access treatment to help prevent them from developing AIDS and from passing the virus on to others.
Anthony S. Fauci