HAART-experienced participants were less likely to start PCP prophylaxis (OR 0.48, 95% CI 0.25-0.91, compared to ART-naive participants) as were those with CD4 cell counts closer to 200 cells/mm3 (OR 0.55, 95% CI 0.42 – 0.70 per 50 cells/mm3) (Table 5). This evidence concerns the gene CD4 and pneumocystosis.