CD4 and squamous cell intraepithelial neoplasia: In another cohort study undertaken in Brazil, 898 HIV-positive women were studied over a 10 year period, and the prevalence and incidence of cervical squamous intraepithelial lesions (SIL) were associated with the severity of HIV.3 The study revealed that CD4 counts ≤200 cells/mm and higher viral load counts were related to SIL incidence.