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. When the vaccine was introduced in 1981, it was recommended for prisoners, health care workers, gay men, and IV drug users. But rates of hep B infection remained unchanged until the vaccine was recommended for all newborns a decade later. Only mass vaccination brought down the rates of infection, and it has now virtually eliminated the disease in children.
