CD8A and infection: Their CD4/CD8 ratio remained low(< 1) during the early days of infection, i.e., 0.76± 0.49 on day 14 (P = 0.0027 vs. baseline) and 0.84± 0.51 on day 34 (P = 0.0053 vs. baseline) —and continued to be low in later days: 1.07 ± 0.61 on day 56 (P = 0.0038 vs. baseline; P = 0.0170 vs. day 34), 0.91 ± 0.47 on day 90 (P = 0.0039 vs. baseline; P = 0.3845 vs. day 34), 0.83 ± 0.50 on day 173 (P = 0.0061 vs. baseline; P = 0.9454 vs. day 34), 0.97 ± 0.89 on day 256(P = 0.0177 vs. baseline; P = 0.5406 vs. day 34), and 1.1 ± 0.97 on day 340 (P = 0.0819 vs. baseline; P = 0.3318 vs. day 34).