Virology
The hepatitis C virus (HCV) is a small, enveloped, single-stranded, positive-sense RNA virus. It is a member of the hepacivirus genus in the family Flaviviridae. There are seven major genotypes of HCV, which are indicated numerically from one to seven.
In the United States, about 70% of cases are caused by genotype 1, 20%
by genotype 2, and about 1% by each of the other genotypes. Genotype 1 is also the most common in South America and Europe.
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