Prevalence Of Human Papillomavirus Types Research Articles

The Impact of the National HPV Vaccination Program in England Using the Bivalent HPV Vaccine: Surveillance of Type-Specific HPV in Young Females, 2010-2016.

The national human papillomavirus (HPV) immunization program was introduced in England in September 2008 using the bivalent vaccine. We collected residual vulva-vaginal swab specimens from 16 to 24-year-old women attending for chlamydia screening between 2010 and 2016 and tested for HPV DNA. We compared changes in type-specific (vaccine and nonvaccine) HPV prevalence over time and association with vaccination coverage. For women with known vaccination status, vaccine effectiveness was estimated. HPV DNA testing was completed for 15459 specimens. Prevalence of HPV16/18 decreased between 2010/2011 and 2016 from 8.2% to 1.6% in 16-18 year olds and from 14.0% to 1.6% in 19-21 year olds. Declines were also seen for HPV31/33/45 (6.5% to 0.6% for 16-18 year olds and 8.6% to 2.6% for 19-21 year olds). Vaccine effectiveness for HPV16/18 was 82.0% (95% confidence interval [CI], 60.6%-91.8%) and for HPV31/33/45 was 48.7% (95% CI, 20.8%-66.8%). Prevalence of HPV16/18 was compared to findings in 2007-2008 (prevaccination) and to predictions from Public Health England's mathematical model. Eight years after the introduction of a national HPV vaccination program, substantial declines have occurred in HPV16/18 and HPV31/33/45. The prevalence of other high-risk HPV types has not changed.

Prevalence of human papillomavirus types associated with cervical lesions in Sergipe state, Northeastern Brazil: high frequency of a possibly carcinogenic type.

Persistent infection with high-risk human papillomavirus (HPV) is the main cause of cervical cancer and the prevalence of HPV types varies depending on the geographic region. Therefore, this study assessed the prevalence of HPV types in women with cervical lesions from Sergipe state, Northeastern Brazil. A cross-sectional study was conducted in women with cervical lesions from March to December 2014. These lesions were investigated by PCR and HPV types were identified by DNA sequencing. 432 patients were included, of which 337 patients tested positive for HPV. Eighteen different HPV types were detected, and high-risk HPV types were detected in 69.2%. HPV 16 (63.4%) was the most prevalent HPV type found, followed by HPV 66 (4.6%), HPV 18 (1.6%) and HPV 45 (1.4%). These results highlight the importance of the high prevalence of HPV 66, which is a possibly carcinogenic virus type not covered by the available vaccines. The prevalence of HPV 16 was high in the studied population, reaffirming the importance of young vaccination. However, the high prevalence of HPV 66 found in this study shows the importance of monitoring the diversity of HPV types in different populations and geographic regions to better understand the impacts of current HPV vaccines.

Low-cost HPV testing and the prevalence of cervical infection in asymptomatic populations in Guatemala

BackgroundA low cost and accurate method for detecting high-risk (HR) human papillomavirus (HPV) is important to permit HPV testing for cervical cancer prevention. We used a commercially available HPV method (H13, Hybribio) which was documented to function accurately in a reduced volume of cervical specimen to determine the most prevalent HPV types and the distribution of HPV infections in over 1795 cancer-free women in Guatemala undergoing primary screening for cervical cancer by cytology.MethodsHR-HPV detection was attempted in cervical samples from 1795 cancer-free women receiving Pap smears using the Hybribio™ real-time PCR assay of 13 HR types. The test includes a globin gene internal control. HPV positive samples were sequenced to determine viral type. Age-specific prevalence of HPV was also assessed in the study population.ResultsA total of 13% (226/1717) of women tested HPV+, with 78 samples (4.3%) failing to amplify the internal control. The highest prevalence was found in younger women (< 30 years, 22%) and older ones (≥60 years, 15%). The six most common HR-HPV types among the 148 HPV+ typed were HPV16 (22%), HPV18 (11%), HPV39 (11%), HPV58 (10%), HPV52 (8%), and HPV45 (8%).ConclusionsIn this sample of cancer free women in Guatemala, HPV16 was the most prevalent HR type in Guatemala and the age-specific prevalence curve peaked in younger ages. Women in the 30-59-year age groups had a prevalence of HR-HPV of 8%, however, larger studies to better describe the epidemiology of HPV in Guatemala are needed.

Racial differences in the prevalence of oncogenic oral human papillomavirus infection types in the United States adult population.

The purpose of this study was to describe the prevalence of oral human papillomavirus (HPV) types according to race and to examine risk factors for oral HPV infection in United States adults. Using 2009-2014 data from the National Health and Nutrition Examination Survey, 13981 subjects were examined. Prevalence of oral HPV and individual oncogenic HPV types were described according to race. Multivariable logistic and linear regressions were used to examine the risk factors for infection and coinfection. Oncogenic and nononcogenic oral HPV infections were significantly more prevalent in black subjects. Infections with oral HPV types 16 and 51 were more prevalent in white subjects, whereas HPV types 35 and 58 were more prevalent in black subjects. We identified 4 oral HPV types that differ by race. Future research on HPV types (especially those that differ by race) may help elucidate their potential role in carcinogenesis and cancer disparities.

Prevalence of High-Risk Human Papillomavirus in Tonsil Tissue in Healthy Adults and Colocalization in Biofilm of Tonsillar Crypts

The pathogenesis of human papillomavirus (HPV)-associated oropharyngeal squamous cell carcinoma is currently an important topic of elucidation. The presence of latent HPV infection in tonsil tissue of healthy adults may provide an explanation for a component of this process and contribute to the understanding of HPV-associated squamous cell carcinoma oncogenesis of the oropharynx. To determine the prevalence of oropharyngeal HPV and to determine the spatial relationship between the virus and crypt biofilm in tonsil tissue. A retrospective, cross-sectional study was carried out using samples obtained from tonsils that were archived at a university hospital following elective nononcologic tonsillectomy from 2012 to 2015. Samples consisted of formalin-fixed paraffin embedded samples of tumor-free tonsil tissue from 102 adults between the ages of 20 and 39 years. Human papillomavirus status was assessed by polymerase chain reaction, and high-risk subtypes 16 and 18 were assessed with quantitative polymerase chain reaction assay. Samples that demonstrated presence of HPV were then analyzed by in situ hybridization to localize the viral capsid protein. These samples were then stained with concanavalin A to establish biofilm presence and morphology. These samples were also stained with diamidino-phenylindole (DAPI) to visualize location of the virus in relation to cell nuclei. These data were then assembled for aggregate analysis to colocalize HPV in the biofilm of the tonsillar crypts. Outcome measurements were determined prior to data collection and include prevalence of high-risk HPV types 16 and 18 in tonsil tissue of otherwise healthy adults, as well as demonstration with immunohistochemistry of HPV in tonsillar crypt biofilm. In 102 otherwise healthy adults (55 [53.9%] female; age range, 20-39 years), the overall prevalence of HPV in tonsils was 4.9% (n = 5); and high-risk type 16 or 18, 3.9% (n = 4). In this sample population, in situ hybridization colocalized HPV virus to the biofilm of the tonsillar crypts. Biofilm is present in the tonsillar crypts in a considerable proportion of tonsil tissues and may be reproducibly identified. Human papillomavirus is demonstrated to colocalize to the crypt biofilm. This has important implications with respect to the determination of HPV prevalence rates in the oropharynx. It may also play a role in the pathogenesis of HPV-related oropharyngeal carcinoma.

High Prevalence of Human Papillomavirus Types 56 and 70 Identified in the Native Populations of Sabah, Malaysia

Background:Cervical cancer is currently the third most common female cancer in Malaysia, with the human papillomavirus (HPV) considered as one of the important contributory factors. This study was conducted to determine HPV prevalence, its genotype distribution, and other potential risk factors among women in Kota Kinabalu, Sabah in order to evaluate the likely efficacy of current HPV vaccines in the local population.Methods:A total of 240 cervical samples were collected and subjected to DNA extraction, PCR amplification using the MY09/MY11 primer pair, and restriction fragment length polymorphism (RFLP) for HPV detection and genotyping. Sociodemographic, clinical, and behavioural data were also collected via questionnaires.Results:The prevalence of HPV infection was 9.6%. The most common HPVs among 13 genotypes were high-risk HPV-56 (16.7%) and probable high-risk HPV-70 (16.7%) followed by HPV-16, -58, -53, -61, -33, -59, and -66 (in decreasing order of prevalence) including the rare genotypes: HPV-62, -81, -82 and -84. Statistical analyses using logistic regression models showed that HPV infection was significantly associated with employment (OR 4.94; CI 1.58-15.40) and education at secondary/high school level (OR 0.13; CI 0.03-0.62).Conclusion:Distribution of HPV genotypes in Sabah indicated a high prevalence of HPV-56 and -70 which are among the rare HPV types in West Malaysia and merit consideration in future strategies for HPV vaccination specifically for local Sabahan women.

A study to assess expression of human papillomavirus types 16 and 18 in oral squamous cell carcinoma using polymerase chain reaction.

Objective:The diverse subset of oral squamous cell carcinoma (OSCC) with different clinical appearance and outcome, independent of traditional risk factors has led to increasing attention in human papillomavirus (HPV) infection.Materials and Methods:The investigation followed a case–control design. Information pertaining to the subjects was retrieved from hospital records. Twenty cases of OSCC and twenty age-matched controls were analyzed to ascertain the prevalence of HPV types 16 and 18. DNA was extracted from the blocks of formalin-fixed paraffin embedded tissues, and HPV-DNA was amplified using HPV type-specific primers by polymerase chain reaction (PCR) method. Data analysis was carried out using Chi-square test.Results:HPV-DNA was detected in 55% of cases (11/20; HPV 16 = 6, HPV 18 = 3 and HPV 16 and 18 = 2) and 30% of controls (6/20; HPV 16 = 3, HPV 18 = 1 and HPV 16 and 18 = 2) indicating higher percentage of HPV presence among OSCC cases. No significant association was found between the presence of HPV and gender, age, site and grade of differentiation of OSCC.Conclusion:Although the presence of HPV was higher in cases compared to controls, none of these differences were statistically significant. HPV 16 and 18 are commonly found in normal oral mucosa mandating the need for distinguishing clinical, subclinical and latent HPV infections.

PCR-RFLP assay as an option for primary HPV test.

Persistent human papillomavirus (HPV) infection is an essential factor of cervical cancer. This study evaluated the analytical performance of restriction fragment length polymorphism polymerase chain reaction (PCR-RFLP) assay compared to PapilloCheck® microarray to identify human papilloma virus (HPV) in cervical cells. Three hundred and twenty-five women were analyzed. One sample was used for conventional cytology and another sample was collected using BD SurePath™ kit for HPV tests. Eighty samples (24.6%) were positive for HPV gene by PCR-Multiplex and were then submitted to PCR-RFLP and PapilloCheck® microarray. There was a genotyping agreement in 71.25% (57/80) on at least one HPV type between PCR-RFLP and PapilloCheck® microarray. In 22 samples (27.5%), the results were discordant and those samples were additionally analyzed by DNA sequencing. HPV 16 was the most prevalent HPV type found in both methods, followed by HPVs 53, 68, 18, 39, and 66 using PCR-RFLP analysis, and HPVs 39, 53, 68, 56, 31, and 66 using PapilloCheck® microarray. In the present study, a perfect agreement using Cohen's kappa (κ) was found in HPV 33 and 58 (κ=1), very good for HPV 51, and good for types 16, 18, 53, 59, 66, 68, 70, and 73. PCR-RFLP analysis identified only 25% (20/80) HPV coinfection, and PapilloCheck® microarray found 62.5% (50/80). Our Cohen's kappa results indicate that our in-house HPV genotyping testing (PCR-RFLP analysis) could be applied as a primary HPV test screening, especially in low income countries. If multiple HPV types are found in this primary test, a more descriptive test, such as PapilloCheck® microarray, could be performed.

Human papillomavirus infection in females with normal cervical cytology: Genotyping and phylogenetic analysis among women in Punjab, Pakistan

BackgroundGlobally, cervical cancer is the fourth most common cancer in women and the seventh most common cancer overall, accounting for an estimated 300 000 annual deaths. Human papillomavirus (HPV) is the second most common cause of cervical cancer worldwide. HPV screening is not a common practice in Pakistan. The aim of this study was to determine the prevalence of HPV and HPV types in women with a normal cytology of the cervix living in the upper and lower regions of Punjab, Pakistan, and to analyze the risk factors for HPV in this region. MethodsPCR analysis was performed for 1011 female patients with a normal cytology of the cervix from various districts of Punjab Province, Pakistan. Risk factors for the acquisition of HPV were studied. High-risk HPV types (HPV16 and HPV18) were detected using the Abbott Real Time HR HPV test. To determine the genotype, partial L1 region sequences of HPV-positive samples were subjected to sequencing using MY/09/MY11 primers, and a phylogenetic tree was constructed using CLC software. ResultsThe study found a 4.74% prevalence of HPV, with the most frequent HPV type found being the low-risk HPV6 (in 25% of infected individuals), followed by HPV55 (22.9%), HPV11 (20.8%), and high-risk types HPV45 (12.5%), HPV33 (8.33%), HPV18 (6.25%), and HPV16 (4.16%). Phylogenetic analysis of all HPV types in this study showed 80–99% nucleotide identity with types related to the same species. The sequences were clustered with China, India, Mexico, Iran, Slovenia, and Germany, showing the diversity in origin of the various genotypes prevalent in Pakistan. ConclusionsIn this population with a normal cervical cytology, the prevalence of high-risk HPV types was very low. The major prevalent HPV genotype in Punjab Province of Pakistan was the low-risk HPV type 6, followed by HPV type 55. Sequencing of the partial L1 region suggested that the region was highly conserved in all reported sequences. This study highlights the need to conduct robust epidemiological studies in the region and to develop regular HPV screening so that the situation does not reach an alarming stage resulting in cervical cancer.

Changes in the prevalence of human papillomavirus following a national bivalent human papillomavirus vaccination programme in Scotland: a 7-year cross-sectional study

On Sept 1, 2008, Scotland launched routine vaccination for human papillomavirus (HPV) types 16 and 18, targeted at 12-13-year-old girls, of whom 92·4% were fully vaccinated in 2008-09. In this study, we report on vaccine effectiveness of the bivalent vaccine in these vaccinated women who attended for routine cervical screening at age 20-21 years. In this 7-year cross-sectional study (covering birth cohorts 1988-1995), we sampled approximately 1000 samples per year from those attending cervical screening at age 20-21 years and tested each for HPV. By linkage to vaccination records we ascertained prevalence by birth cohort and vaccination status. Estimates of vaccine effectiveness for HPV types 16 and 18, HPV types 31, 33, and 45, other high-risk types, and any HPV were calculated using logistic regression. In total, 8584 samples were HPV genotyped. Prevalence of HPV types 16 and 18 reduced substantially from 30·0% (95% CI 26·9-33·1) in the 1988 cohort to 4·5% (3·5-5·7) in the 1995 cohort, giving a vaccine effectiveness of 89·1% (85·1-92·3) for those vaccinated at age 12-13 years. All cross-protective types showed significant vaccine effectiveness (HPV type 31, 93·8% [95% CI 83·8-98·5]; HPV type 33, 79·1% [64·2-89·0]; HPV type 45, 82·6% [61·5-93·9]). Unvaccinated individuals born in 1995 had a reduced odds of HPV types 16 and 18 infection compared with those born in 1988 (adjusted odds ratio 0·13 [95% CI 0·06-0·28]) and reduced odds of HPV types 31, 33, and 45 (odds ratio 0·45 [0·23-0·89]). Bivalent vaccination has led to a startling reduction in vaccine and cross-protective HPV types 7 years after vaccination. There is also evidence of herd protection against the vaccine-specific and cross-protective types in unvaccinated individuals born in 1995. These findings should be considered in cost-effectiveness models informing vaccine choice and models to shape the future of cervical screening programmes. Scottish Government and Chief Scientists Office.

Genital HPV infection among heterosexual and homosexual male attendees of sexually transmitted diseases clinic in Beijing, China.

Human papillomavirus (HPV) has been identified as etiologic agent of various cancers for both men and women. However, HPV vaccine has not been recommended for men in China by far. To provide more evidences to promote HPV vaccination among males at high-risk of infection, this study investigated genital HPV genotypes among male attendees of sexually transmitted disease (STD) clinic. Male attendees (⩾18 years old) were recruited from STD clinic of Beijing Ditan Hospital. Data on sociodemographic characteristics and self-reported sexual behaviors were collected based on questionnaire. Genital swab specimens were collected for HPV genotypes. Finally, a total of 198 eligible participants were included in the study. Nearly half of them were infected with at least one type of HPV. The prevalence of genital infection among participants with only heterosexual behaviors (50·91%, 56/110) was significantly higher than those with only homosexual behaviors (36·36%, 32/88) (P < 0·001). However, the distribution pattern of the most frequently observed HPV subtypes were found to be similar between these two subgroups. HPV31, HPV18, HPV16 and HPV58 were the most frequently identified high-risk types and HPV11, HPV6, HPV81 and HPV61 were the most frequently observed low-risk types. Our results, although need further verification by larger sample size, suggested that currently available HPV vaccines covered most prevalent HPV types observed in Chinese men. As HPV vaccine has been approved for application in females in China, molecular epidemiological studies and intervention studies among high-risk males should be promoted as well.

Preliminary study of analyzing mucosal human papillomaviruses in cutaneous warts by restriction fragment mass polymorphism.

Cutaneous human papillomavirus (HPV) types 1, 2, 4, 7 and 57 are reportedly found in cutaneous warts. However, there are few reports that have investigated the prevalence of mucosal HPV types in cutaneous warts. The aim of this study is to investigate the prevalence of mucosal HPV types in patients with cutaneous warts and to determine any association between HPV types and patient characteristics. We analyzed 62 wart samples that were taken from patients who were diagnosed with cutaneous warts, and 30 normal skin samples were used as negative control. We recorded the following characteristics: sex, age, type of warts, duration of warts, number of warts and patient's immune status. A matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry (MS)-based restriction fragment mass polymorphism (RFMP) assay was used for HPV genotyping. Of the total 62 wart samples, 50 samples (81.6%) were positive for HPV genotypes. All of the negative controls (30 samples) using normal skin showed negative reaction. Mucosal HPV types (49 samples, 84.4%) were highly detected, and high- or probable high-risk HPV types (39 samples, 67.2%) were more common than lower risk HPV types (10 samples, 17.2%). A statistically significant association was observed between sex, age, duration of warts and the risk of HPV types. To the best of our knowledge, this is the first study to use the RFMP assay to analyze cutaneous wart-associated mucosal HPV types. The high prevalence of high-risk and probable high-risk HPV in this study is of great significance.

Human papillomavirus type distribution and HPV16 intratype diversity in southern Brazil in women with and without cervical lesions.

BACKGROUND Increasing evidence suggests that human papillomavirus (HPV) intratype variants (specific lineages and sublineages) are associated with pathogenesis and progression from HPV infection to persistence and the development of cervical cancer.OBJECTIVES This study aimed to verify the prevalence of HPV infection and distribution of HPV types and HPV16 variants in southern Brazil in women with normal cytology or intraepithelial lesions.METHODS HPV typing was determined by L1 gene sequencing. To identify HPV16 variants, the LCR and E6 regions were sequenced, and characteristic single nucleotide variants were identified.FINDINGS A total of 445 samples were studied, with 355 from cervical scrapes and 90 from cervical biopsies. HPV was detected in 24% and 91% of these samples, respectively. The most prevalent HPV types observed were 16 (cervical, 24%; biopsies, 57%) and 58 (cervical, 12%; biopsies, 12%). Seventy-five percent of the HPV16-positive samples were classified into lineages, with 88% defined as lineage A, 10% as lineage D, and 2% as lineage B.MAIN CONCLUSIONS This study identified a high frequency of European and North American HPV16 lineages, consistent with the genetic background of the human population in southern Brazil.

Characterization of HPV18 E6-specific T cell responses and establishment of HPV18 E6-expressing tumor model

Human papillomavirus (HPV) has been identified as the primary etiologic factor of cervical cancer, and subsets of anogenital and oropharyngeal cancers. HPV18 is the second most prevalent high-risk HPV type after HPV16. Furthermore, HPV18 is responsible for approximately 12% of cervical squamous cell carcinoma and 37% of cervical adenocarcinoma cases worldwide. In this study, we aimed to characterize the HPV18-E6-specific epitope and establish an HPV18 animal tumor model to evaluate the E6-specific immune response induced by our DNA vaccine. We vaccinated naïve C57BL/6 mice with a prototype DNA vaccine, pcDNA3-HPV18-E6, via intramuscular injection followed by electroporation, and analyzed the E6-specific CD8+ T cell responses by flow cytometry using a reported T cell epitope. We then characterized the MHC restriction element for the characterized HPV18-E6 epitope. Additionally, we generated an HPV18-E6-expressing tumor cell line to study the antitumor effect mediated by E6-specific immunity. We observed a robust HPV18-E6aa67-75 peptide-specific CD8+ T cell response after vaccination with pcDNA3-HPV18-E6. Further characterization demonstrated that this epitope was mainly restricted by H-2Kb, but was also weakly presented by HLA-A∗0201, as previously reported. We observed that vaccination with pcDNA3-HPV18-E6 significantly inhibited the growth of HPV18-E6-expressing tumor cells, TC-1/HPV18-E6, in mice. An antibody depletion study demonstrated that both CD4+ and CD8+ T cells are necessary for the observed antitumor immunity. The characterization of HPV18-E6-specific T cell responses and the establishment of HPV18-E6-expressing tumor cell line provide infrastructures for further development of HPV18-E6 targeted immunotherapy.

Methylation of HPV and a tumor suppressor gene reveals anal cancer and precursor lesions.

We studied DNA methylation patterns of human papillomavirus (HPV) and tumor suppressor gene EPB41L3 in 148 anal and perianal biopsies to determine whether high levels of methylation would be associated with anal intraepithelial neoplasia (AIN). The most prevalent HPV type was HPV16, detected in 54% of the 30 benign biopsies, 33% of the 43 low-grade AIN (lgAIN), 82% of the 59 high grade AIN (hgAIN) and 4 of the 5 anal cancers. A methylation score was developed (0.561*HPV16me+0.439*EPB41L3) which had increasing values with severity of disease: the mean was 8.1% in benign, 13.2% in lgAIN, 22.3% in hgAIN and 49.3% in cancers (p < 0.0001). The methylation score as a triage classifier at a cut-off of 8.8 gave a sensitivity of 90.6% (95% CI: 82.8, 96.9), specificity of 50.7% (95% CI: 39.7, 61.6) and area under the curve of 0.82 (95% CI: 0.75–0.89) for separating hgAIN and cancer from benign and lgAIN biopsies. We conclude that methylation of HPV16 and EPB41L3 show highly significant association with increasing severity of AIN and cancer and may be useful as biomarkers in anal disease.

Prevalence of oral human papillomavirus by vaccination status among young adults (18–30 years old)

BackgroundAlthough there is evidence that human papillomavirus (HPV) vaccination may protect against oral HPV infection, no current research has demonstrated this in the general population. MethodsWe used repeated cross-sectional data from the National Health and Nutrition Examination Survey (NHANES) between 2009 and 2014. Participants 18–30years who indicated whether they had received the HPV vaccine and provided an adequate oral sample were included (N=3040). Oral HPV types were grouped by vaccine-type (types 6, 11, 16, 18) and by risk (high or low risk). Chi-square analyses compared oral HPV prevalence by vaccination status. ResultsVaccinated adults had a lower prevalence of vaccine-type oral HPV (types 6, 11, 16, 18) compared to unvaccinated adults. Prevalence of non-vaccine high-risk oral HPV was similar between HPV vaccinated and unvaccinated participants. ConclusionsHPV vaccination appears to provide protection against vaccine-type oral HPV infection among males and females in the general population.

The Frequency and Typing of Human Papilloma Virus Among Women with Normal and Abnormal Cytology in Southern Khorasan, Eastern Iran

Background: Infection by certain types of human papilloma virus (HPV) is known as a causal and essential factor for cervical cancer, the second most common malignancy in women around the world. Objectives: The aim of this study was to determine the frequency and types of HPV among women with normal and abnormal cytology in Southern Khorasan, eastern Iran. Methods: This was a cross-sectional study with 253 randomized Pap smear samples from women who were referred to gynecologist clinics. Human papillomavirus-DNA testing (a nested PCR with primers MY09/ MY11 and GP5 +/ GP6 +) was performed on Pap smear samples. The first round PCR product was subjected for sequencing to determine the HPV types. Phylogenic analysis with Mega 6 was carried out to determine the relationship between HPV types. Results: The mean age of patients were 34.47 ± 5.38 years; 85.77% with normal cytology, and the rest were with an abnormality; atypical cells of undetermined significance (ASCUS) and Low-grade squamous intraepithelial lesions (LISL). Human papilloma virus-DNA was detected in 18.57% of population (15.66% of normal and 36.11% of abnormal group) with the most prevalent HPV types 6 and 11. The HPV type 84 was identified in a case. Conclusions: The result of this study revealed a partially high prevalence of HPV in women with normal cytology which are high risk for transmission in population. It is suggested that HPV testing should be carried out along with Pap test in screening programs to enhance early detection of neoplasia and intended infections.

Prevalence of Genital Human Papillomavirus in Males, United States, 2013-2014.

We report the first nationally representative prevalence data on genital human papillomavirus (HPV) in males in the United States, using findings from the National Health and Nutrition Examination Surveys, 2013-2014. Using penile swabs from males aged 14-59 years, we estimated the HPV DNA prevalence and prevalence ratios (PRs) with respect to sexual behaviors and demographic characteristics. The prevalence of any HPV was 42.2% (95% confidence interval [CI], 38.3%-46.1%) and of high-risk (HR) HPV was 23.4% (95% CI, 21.3%-25.6%). Prevalence of any HPV was 12.5% in 14-19 year olds and was higher in older age groups, through ages 25-29 years, and then similar through age 59 years. After adjustment for age and race, any HPV prevalence was associated with lifetime number of sex partners (≥15 vs 1-2; PR, 3.27; 95% CI, 2.12-5.02) and past-year number of sex partners (≥2 vs 0; PR, 1.26; 95% CI, 1.09-1.46). Comparisons of consecutively older age groups revealed that the prevalence of quadrivalent HPV vaccine types (4vHPV), types 6, 11, 16, and 18, was significantly higher only between ages 25-29 and 20-24 years (PR, 2.79; 95% CI, 1.31-5.96), whereas the prevalence of other HPV types was significantly higher only between ages 20-24 and 14-19 years (PR, 3.39; 95% CI, 2.49-4.61). Overall, 42.2% of US males aged 14-59 years have detectable genital HPV infections. Differences in the age-specific prevalence of 4vHPV types and non-4vHPV types suggest that the vaccination program has had an impact on the prevalence of HPV types 6, 11, 16, and 18 among males.

The Prevalence and Genotype Distribution of Human Papillomavirus Types in the General Female Population in West of Iran

Background: Human Papillomavirus (HPV) plays a necessary etiological role in cervical cancer, it is logical to use HPV as a marker for the early detection of cervical cancer and precancerous. Prevalence of HPV infection and HPV genotypes vary among different regions. Objectives: The aim of the present study was to investigate the frequency of HPV and its genotype distribution in cervical specimens of the patients who had attended to the pathology laboratories of Kermanshah, Iran. Methods: Cervical swaps, genital, and skin biopsy were obtained from each participant. DNA of HPV specimens were extracted using a genomics extraction kit. PCR amplification and genotyping were employed to investigate the presence of High-risk (HR) and Low-risk (LR) genotypes and also the types of HPV. Results: Human Papillomavirus was found in 62.1% of the samples obtained from the patients. Among the HR and LR types, HPV-6 was the major genotype 64.8%. Type 16 and 18 were the most frequent HR-HPV types (presented in 26% of the patient), followed by type 50s (24.7%), 45, 30s, and 11 (1.8% from each). Multiple HPV infections were presented in 40.7% of the positive genotyping specimens. Conclusions: In comparison with previous surveys done in other parts of Iran, we noticed higher frequency of HPV among the collected isolates and also the higher prevalence of HPV types 6, 16, 18, and 50s in this region of Iran. It seems that HPV vaccination as well as an organized prevention program can be safe and efficient to reduce HPV types.

Human papillomavirus infection among Bangladeshi women with cervical intraepithelial neoplasia and chronic cervicitis

Background and objectives: Cervical cancer is one of the leading causes of morbidity and mortality. Human papillomavirus (HPV) is known to be associated with cervical intraepithelial neoplasia (CIN) and cancer. The objective of the present study was to determine the rate of HPV infection among the Bangladeshi women with different grades of CIN and cancer.Methods: Women aged 20 to 55 years, diagnosed as a case of chronic cervicits, cervical intraepithelial neoplasia (CIN) or invasive cancer by Papanicolaou (Pap) smear and colposcopy directed biopsy were enrolled in the study. High and intermediate risk oncogenic HPV were detected in cervical samples by real time PCR (rt-PCR).Results: Seventy two women with chronic cervicitis and different grades of CIN were included in the study. Out of 72 cases, 28 (38.9%) and 44 (61.1%) had chronic cervicitis and CIN respectively. Overall, the HPV infection rate was 43.1% (95% CI= 32%-54%) among the study population. CIN cases had significantly high (p&lt;0.01) HPV infection (78.6%; 95% CI=60%-89%) compared to cases with chronic cervicitis (18.2%; 95% CI=11.1%-34.5%). Women between the age of 20-30 years had the highest positive rate (50.0%) followed by 31- 40 years age group (43.6%). All CIN grade 2 and 3 had HPV infection.Conclusion: The study showed that HPV was strongly associated with different grades of CIN. Specific HPV types should be determined to find out the most prevalent HPV types among the Bangladeshi women with CIN and cervical cancers.IMC J Med Sci 2016; 10(1): 29-32