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Growth curves for an HIV-1 isolate in PHA lymphoblasts inoculated on day 3 (closed circles) and day 7 (open circles). Closed circles show the typical triphasic growth curve for an HIV-1 isolate after inoculation of lymphoblasts on day 3, with a lag phase (days 0 to 1), exponential phase (days 1 to 6) and plateau phase (days 6 to 10). Open circles show growth of the same HIV-1 isolate on PHA lymphoblasts inoculated on day 7. All data points are the mean ± range of two parallel cultures.
