Abstract
The rate of processes accompanying the transition of the HIV-1 epidemic from nascent stage to concentrated one in the Former Soviet Union (FSU) during intravenous drug user (IDU)-associated HIV infection outbreaks in 1994-1999 has not been analyzed. To define the rates, we studied susceptible populations and circulating viruses before, during, and after the outbreaks. Our findings included the following: (1) the pattern of high HIV-1 genetic diversity characteristic of the nascent epidemic changed to a concentrated one within 1 year in St. Petersburg and in Moscow; (2) different FSU regions were at different stages of the HIV-1 epidemic in 1994-1996; (3) the change of serotypic patterns characteristic of different stages of the HIV/AIDS epidemic for the non-IDU risk group occurred within 1 year in Moscow, suggesting an extremely high rate of IDU-associated epidemic pattern distributions in regions and susceptible populations in the FSU.
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