Figure 1From: Anal cytological abnormalities and epidemiological correlates among men who have sex with men at risk for HIV-1 infection Distribution of anal cytological abnormalities among 299 HIV-uninfected MSM. Anal samples, collected with a Dracon swab and stored in PreservCyt, were used for liquid-based cytology to evaluate the presence of cytological abnormalities. These were classified following the Bethesda 2001 guidelines.Back to article page