Boomers May Be Last Boom of Hepatitis C

A new study of US blood donors shows a "strikingly lower prevalence" of
hepatitis C virus (HCV) compared with 1992-93, according to lead researcher
Dr. Edward Murphy of the University of California-San Francisco.

     HCV is a blood-borne infection that is primarily contracted from dirty
syringes, but a small number of cases are sexually transmitted or passed
from mother to infant during childbirth. The body can clear hepatitis C,
though infections become chronic 75 percent to 85 percent of the time. CDC
estimates that 1 percent to 5 percent of people with chronic HCV eventually
die of cirrhosis or liver cancer.

     In the early 1990s, about a half a percent of blood donors were
positive for HCV antibodies, indicating either a chronic infection or past
infection that cleared. From 2006 to 2007, the study analyzed samples from
nearly 960,000 blood donors at six US blood banks, finding less than a tenth
of a percent were positive for HCV antibodies.

     Murphy said the decrease probably reflects an overall decline of
hepatitis C, especially among younger Americans. The baby boom generation,
which had higher rates of injection drug use than subsequent generations,
has more carriers of the infection and is at higher risk for HCV-related
liver disease.

     Two other factors for higher risk of hepatitis C among blood donors
were found. Among women, the odds of having HCV antibodies increased with
the number of children they had given birth to - from 1 infection in 3,300
among women who had never given birth to 1 in 1,000 among women with five or
more children.

     Obese adults were less likely than their normal-weight peers to have
HCV antibodies. And among those with antibodies, obese persons were less
likely to have the genetic material that signals the ongoing presence of
HCV.

     The study, "Hepatitis C Virus Prevalence and Clearance Among US Blood
Donors, 2006-2007: Associations with Birth Cohort, Multiple Pregnancies, and
Body Mass Index," was published in the Journal of Infectious Diseases

Amy Norton, Reuters