CD4 and pulmonary tuberculosis: In the Phidisa morbidity and mortality cohort, POD (AIDS or pulmonary TB) rates were significantly lower for those with counts of 500 cells or higher compared to those with latest CD4+ counts 350–499; however, the absolute rate differences were small (3.1 versus 1.8, overall; 2.8 versus 1.8 for those on ART; and 4.0 versus 2.1 per 100 person years for those not on ART).