PRO> Hepatitis B – USA (03): injection drug use, comment

Hepatitis B — United States
Dr Jones comments that, because the average age of hepatitis B cases is 40 while the average age of hepatitis C cases is 30, it will be some time before we see the impact of infant immunization on hepatitis B transmission among injection drug users. An alternative interpretation of this data is that since routine immunization of infants against hepatitis B began 20+ years ago, immunization is already having the desired impact by preventing cases among drug users in their teens and early 20s.