CD4 and alternating hemiplegia of childhood: Of 93 HIV/AHC cases, the median CD4 count was 519 cells/mm3 (range, 27–1208; 20 [22%] with CD4 count <350 cells/mm3) and the median PVL was undetectable (range, <20 to 1.2 x 106 copies/ml; 63 [68%] with a PVL <400 copies/ml) at the time of AHC diagnosis, and 70 (75%) had received ART before AHC diagnosis.