Compared with the CHI group, the AHI group had shorter estimated infection time [65.0 (38.5–106.0) days vs. 631.0 (133.0–1135.0) days, p < 0.001] and higher CD4 cell counts [404.0 (281.5–531.5) cell/μl vs. 173.0 (113.3–243.2) cell/μl, p < 0.001]. This evidence concerns the gene CD4 and infection.