The median CD4 count was higher for M. tuberculosis infection (52, IQR = 18 – 110) and Kaposi's sarcoma (46.5, IQR = 23.5 – 227.5) than for Pneumocystis carinii pneumonia (16.5, IQR = 9 – 40), herpes simplex (25, IQR = 9 – 63) and extrapulmonary cryptococcosis (13, IQR = 6.5 – 39) (table 1). The gene discussed is CD4; the disease is Kaposi's sarcoma.