CD4 and pneumocystosis: Among the 75 patients for whom the CD4+ T cell counts were below 50 ×106/L, 44 patients (58.67%) were infected with P. jirovecii. Among the 18 patients for whom the CD4+ T cell counts were between 51× 106/L and 100 ×106/L, 7 patients (38.89%) were infected with P. jirovecii. Among the 32 patients for whom the CD4+ T cell counts were between 101 × 106/L and 200 × 106/L, 9 patients (28.13%) were infected with P. jirovecii. PCP was not found in the 22 patients with CD4+ T cell count >200 ×106/L, as shown in Table 4.