CD4 and toxic epidermal necrolysis: Risk factors for nevirapine-induced SJS/TEN include female gender, baseline CD4 counts > 250 cells/mm3 in women and > 400 cells/mm3 in men, history of drug allergy, low body weight, high nevirapine serum levels and certain human lymphocyte antigen types.5,51,52 Pregnant woman in the study had a mean CD4 count of 267.2 (s.d. 60.6) cells/mm3, a risk factor in keeping with nevirapine-induced SJS/TEN as noted in the literature.