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Susceptibility of CD4+ cells from EU individuals to in vitro infection with HIV-1. The CD4+ cells from eight EU individuals (■) and four randomly selected unexposed control subjects (░⃞) were infected in vitro with HIV-1SF2 at 100 TCID50 per 106 cells. Evidence of virus production was measured by RT activity per ml of culture fluid collected at several time points post-inoculation. Data are shown for the day of peak virus replication (day 10).
