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Background: To study the prevalence of high-risk human papillomavirus (HPV) types 16, 18, 31 and 33 in healthy Thai women using polymerase chain reaction (PCR) technique. Material and method: Two hundred and sixty three healthy urban women in Pathumthani, Thailand were recruited. Cervical cancer screening was performed and residual specimen from Pap smears was subjected to PCR to identify the presence...