CD4 and pneumocystosis: We therefore estimated a total of 33,380 and 6624 cases of PCP in adults and children in 2016 (126 cases per 100,000 person–years and 25 cases per 100,000 person–years), respectively, assuming a 16.3% incidence in adults and 9.2% in children of those with CD4 counts under 200 × 106/mL in adults and advanced HIV in children [20] (Table 2).