Furthermore, the association was remained either in subgroup of CD4<200/μl or ≧200/μl (n = 293 and 274, log-rank, p = 0.030 and 0.021, respectively, Fig 1B and 1C) although patients with baseline CD4<200/μl had been taken TMP/SMX, it can be a strong confounder of PCP onset. The gene discussed is CD4; the disease is pneumocystosis.