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HCV phylogenetic tree (combined NS5B fragments) and clustering of patients diagnosed with HCV-4 infection in the Amsterdam region. The risk factors allocated for each patient are listed opposite each sequence: born in Egypt (⋄), born in other areas where HCV is endemic area (A), IDU (•), high-risk sexual behavior of MSM (▿), blood transfusion in Europe before 1991 (×), and other or unknown (−).
