Multiple Introduction and Naturally Occuring Drug Resistance of HCV among HIV-Infected Intravenous Drug Users in Yunnan: An Origin of China's HIV/HCV Epidemics.

According to a nation-wide phylogeographic analysis, 3b showed a trend for migration from the southwest to other regions, which is consistent with the known drug trafficking route in which Yunnan links the Golden Triangle to the inland of China.

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The constituent ratio of subtype 3a showed a decreasing trend from the eastern prefectures to the western ones, however, the changing trend of subtype 6n was the opposite of this.

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