Persistence or Clearance of Human Papillomavirus Infections in Women in Ouro Preto, Brazil

Persistent high-risk (HR) human papillomavirus (HPV) infection is necessary for development of precursor lesions and cervical cancer. We investigate persistence and clearance of HPV infections and cofactors in unvaccinated women. Cervical samples of 569 women (18-75 years), received for routine evaluation in the Health Department of Ouro Preto, Brazil, were collected and subjected to PCR (MY09/11 orGP5+/6+ primers), followed by RFLP or sequencing. All women were interviewed to collect sociodemographic and behavioral information. Viral infection persistence or clearance was reevaluated after 24 months and was observed in 59.6% and 40.4% of women, respectively. HPVs 16, 33, 59, 66, 69, and 83 (HR) were the most persistent types whereas HPVs 31, 45, and 58 were less persistent. Clearance or persistence did not differ between groups infected by HPVs 18, 53, and 67. in low-risk (LR) types, HPV 6 infected samples were associated with clearance, while HPV 11, 61, 72, or 81 infected samples were persistent in the follow-up. No statistically significant association was detected between persistent HPV infections and sociodemographic and behavioral characteristics analyzed. To study persistence or clearance in HPV infection allows the identification of risk groups, cofactors, and strategies for prevention of cervical cancer.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)PRONEX/FACEPEFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Fundação ButantanCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Inst Butantan, Genet Lab, BR-05503900 São Paulo, BrazilUniv Ouro Preto UFOP, Escola Farm, Dept Anal Clin, BR-35400000 Ouro Preto, MG, BrazilUniversidade Federal de São Paulo, Dept Ginecol, Lab Tocoginecol, BR-04039032 São Paulo, BrazilUniv Fed Pernambuco UFPE, LIKA, BR-50670901 Recife, PE, BrazilUniv São Paulo, Programa Posgrad Interunidades Biotecnol, BR-05508900 São Paulo, BrazilUniv Fed Integracao Latinoamer UNILA, Dept Biol, BR-85867970 Foz Do Iguacu, PR, BrazilUniversidade Federal de São Paulo, Dept Ginecol, Lab Tocoginecol, BR-04039032 São Paulo, BrazilCNPq: 554816/2006-7PRONEX/FACEPE: APQ-0781-4.01/06FAPESP: 2006/02439-6Web of Scienc

Human papillomavirus infection in Brazilian women with normal cervical cytology

We examined the prevalence of human papillomavirus (HPV) infection in a sample of Brazilian women presenting normal cervical cytology. Possible interactions between patient characteristics and HPV infection were analyzed in order to provide background data to improve cervical cancer screening and prophylaxis. Cervical samples of 399 women, received for routine evaluation in the Health Department of Ouro Preto, MG, Brazil, were subjected to HPV-DNA testing by PCR with MY09/11 primers. HPV-positive specimens were typed by RFLP. A structured epidemiological questionnaire was administered to each woman. HPV prevalence among these cytologically normal women was 11%. Twelve viral types were detected, the most common being HPV-16, -6, -61, -83, and -66. HPV was more prevalent in younger women; high-risk viral types were detected in 61% of the infected women and 27% of the infected women had multiple HPV infections. Significant associations of HPV infection were found with age, literacy, residence, marital status, lifetime number of sexual partners, and parity. We detected a great diversity of HPV types in women with normal cytology. This kind of information about local populations is useful for HPV prevention and vaccination strategies.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FACEPE (PRONEX)Inst Butantan, Dept Genet, Genet Lab, São Paulo, BrazilUniv Fed Ouro Preto, Escola Farm, Dept Anal Clin, Ouro Preto, MG, BrazilUniversidade Federal de São Paulo, Dept Ginecol, Lab Tocoginecol, São Paulo, BrazilUniversidade Federal de São Paulo, Dept Morfol & Genet, São Paulo, BrazilUniv Fed Pernambuco, Dept Bioquim, Lab Imunopatol Keizo Asami, Recife, PE, BrazilUniv Fed Integracao Latinoamer, Dept Ciencias Biol, Foz Do Iguacu, PR, BrazilUniversidade Federal de São Paulo, Dept Ginecol, Lab Tocoginecol, São Paulo, BrazilUniversidade Federal de São Paulo, Dept Morfol & Genet, São Paulo, BrazilWeb of Scienc