Figure 1From: Prevalence of high-risk human papillomavirus types in Mexican women with cervical intraepithelial neoplasia and invasive carcinomaAlgorithm for high-risk HPV detection in cervical scrapings from women with dysplastic and neoplastic lesions. It checks first for the presence of HPV DNA through nested PCR (expected to be positive in most samples) and then for the amplificability of β-globin DNA in HPV-negative samples (expected to be rare).Back to article page