FIG. 2.

Replication kinetics of the 18 viral isolates as assessed by parallel infection of PHA-stimulated CD4⁺ T-lymphocytes. The growth rates (g) shown represent the means ± standard deviations from two different infections, each performed in duplicate. (A) Growth rates of the individual viral isolates; (B) growth rates of the nine drug-resistant viruses with respect to the drug class affected; (C) comparison of the growth rates for each drug resistance class with that of the group of wild-type (WT) (drug-susceptible) isolates. * and +, viral isolates that are phylogenetically related.