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J Infect Dis 171: 1607-1610 (1995)
Relationship between hepatitis C virus genotypes and sources
of infection in patients with chronic hepatitis C
J. M. Pawlotsky, L. Tsakiris, F. Roudot-Thoraval, C. Pellet,
L. Stuyver, J. Duval & D. Dhumeaux Department of Bacteriology
and Virology, Hopital Henri Mondor, Universite Paris XII, Creteil,
France.
This study examined the relationships between hepatitis C virus
(HCV) genotypes and the routes of HCV transmission in 101 patients
with chronic hepatitis C. Patients who received blood transfusions
(43%) and those with chronic hepatitis C of unknown cause (37%) had
similar mean ages, age distribution, and HCV genotype distribution
(1a, 19% vs. 14%; 1b, 52% vs. 54%; 3a, 10% vs. 9%; other, 19% vs.
23%). Intravenous drug users (IVDUs) were significantly younger and
had a different genotype distribution (1a, 33%; 1b, 0; 3a, 63%;
other, 5%; P < .001). Transmission of HCV 3a has been observed
only over the past 20 years; other genotypes were transmitted up to
40 years ago. These results suggest that for 20 years there have
been two independent ongoing hepatitis C epidemics. One affects
persons who received blood transfusions or whose source of
infection is unknown. These persons are older and are mainly
infected by HCV 1b. The second type of infection occurs in IVDUs
and infects younger persons, mainly with HCV 3a.
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