- Research article
- Open Access
Prevalence, concordance and determinants of human papillomavirus infection among heterosexual partners in a rural region in central Mexico
BMC Infectious Diseases volume 10, Article number: 223 (2010)
Although human papillomavirus (HPV) infection in heterosexual couples has been sparsely studied, it is relevant to understand disease burden and transmission mechanisms. The present study determined the prevalence and concordance of type-specific HPV infection as well as the determinants of infection in heterosexual couples in a rural area of Mexico.
A cross-sectional study was conducted in 504 clinically healthy heterosexual couples from four municipalities in the State of Mexico, Mexico. HPV testing was performed using biotinylated L1 consensus primers and reverse line blot in cervical samples from women and in genital samples from men. Thirty-seven HPV types were detected, including high-risk oncogenic types and low-risk types. Multivariate logistic regression models were utilized to evaluate factors associated with HPV.
The prevalence of HPV infection was 20.5% in external male genitals and 13.7% in cervical samples. In 504 sexual couples participating in the study, concordance of HPV status was 79%; 34 partners (6.7%) were concurrently infected, and 21 out of 34 partners where both were HPV positive (61.8%) showed concordance for one or more HPV types. The principal risk factor associated with HPV DNA detection in men as well as women was the presence of HPV DNA in the respective regular sexual partner (OR = 5.15, 95%CI 3.01-8.82). In men, having a history of 10 or more sexual partners over their lifetime (OR 2.5, 95%CI 1.3 - 4.8) and having had sexual relations with prostitutes (OR 1.7, 95%CI 1.01 - 2.8) increased the likelihood of detecting HPV DNA.
In heterosexual couples in rural regions in Mexico, the prevalence of HPV infection and type-specific concordance is high. High-risk sexual behaviors are strong determinants of HPV infection in men.
Although there is clear evidence for the influence of the male factor in the development of cervical neoplasia[1, 2], HPV transmission in heterosexual couples has rarely been studied. The few studies conducted have included the male sexual partners of women with clinical HPV lesions [3–8] In addition, heterosexual couples have been studied through controlled clinical trials to evaluate the effect of the use of condoms on the rate of persistence of flat penile lesions. Previous reports from prospective studies of women initiating sexual life have estimated an accumulated HPV risk of 50% over a period of three years. The risk of HPV infection in these women increases if the male sexual partner had initiated sexual life at an early age. In light of the scarce studies exploring HPV transmission among heterosexual couples, mathematical models have emerged to simulate HPV transmission dynamics. A greater transmissibility of HPV has been estimated as compared to other sexually transmitted infections, such as HIV and type 2 herpes simplex. Information about HPV transmission probabilities in couples is of paramount importance to evaluate the impact of prophylactic vaccines against HPV and to monitor the distribution of specific types before and after the introduction of HPV vaccines.
The goal of the present study was to determine genital HPV prevalence in sexual couples, evaluate HPV type-specific concordance and the association of known risk factors of HPV infection in a low-risk, predominantly monogamous population.
We conducted an HPV DNA prevalence and type-specific concordance study in 504 heterosexual couples attending first-level health centers for medical attention in four municipalities belonging to the Texcoco Sanitary District in the State of Mexico, in the central region of the Mexican Republic. Three of the municipalities had rural characteristics (Atenco, Tepetlauxtoc, Texcoco) and one was semi-urban (Chimalhuacan). The study period was November 2002 to September 2003.
The study partners were identified and selected using convenience sampling in healthcare centers. First, women who consistently sought care in health centers for diverse reasons were identified and invited to participate. The women who were accepted into the study were asked to invite their regular sexual partner to participate (having been a sexual couple for six or more months even if they were not living in the same house). Subjects were invited to participate after a talk about HPV infection and its association with cervical cancer given at the participating healthcare centers. Since the professional occupation for 65% of this population is agriculture, the study was conducted during the morning hours to increase the likelihood that the male sexual partner would attend.
Sexual couples were included when both partners were available to participate in the study; excluded were sexual couples in which the female partner was pregnant or had a hysterectomy.
Male partners were instructed not to wash their genitals for at least 12 hours prior to the examination and to be sexually abstinent for three days. Female partners were asked to be sexually abstinent and not menstruating.
After receiving written informed consent guaranteeing confidentiality, and in complete privacy, a self-administered questionnaire was completed to obtain information about socioeconomic variables, educational level, smoking habits, reproductive history, use of contraceptive methods and sexual behavior factors. The couples answered the questionnaire in separate locations. The questionnaires and collection of biological samples for each partner were carried out on the same day at the corresponding health center. The study was approved by the ethical and research committees at the institutions that participated in the study. The overall response rate was 60%.
Collection of specimens
The methods used to collect the samples from the male genital area have previously been described. Briefly, epithelial cells from three anatomic sites were obtained using a cytobrush and a Dacron swab: The first sample was obtained from the scrotum and the penile shaft, the second from the balano-preputial lamina, and the third from the urinary meatus. The three samples were combined into one single tube and stored.
In women, a sample of epithelial cells was taken from the exocervix and endocervical canal using a nylon cytobrush, which was rotated 360°C to assure sampling of the cervical transformation zone. All genital samples were collected by a trained doctor. All brushes containing the collected material were placed in a 5 ml aliquot of phosphate-buffered saline (PBS)/merthiolate 0.01% (v/v). The samples were maintained at -20°C for an average of 30 days, until their delivery to the laboratory. The samples were also stored at -20°C in the laboratory prior to DNA extraction.
Previous to DNA extraction all samples which arrived at the lab were centrifuged at 4500 rpm for 6 minutes, after pellet was suspended in 1 ml of 0.01 M TRIS HCL pH 7.4. Briefly, genital samples were treated with proteinase K (170 ug/ml). The DNA extraction was performed with phenol-chlorophorm/isoamyl alcohol 24:1, then NaCl 5 M was added and precipitated with isopropanol. Finally pellet was suspended in 50 μl of buffer TE pH 7.6 and stored at -70°C .
HPV DNA amplification, detection and genotyping
HPV DNA amplification
Was performed using DNA hybridization test as described by Gravitt et al . After sample extraction amplification of HPV DNA and β-globin was conducted in separate reactions. HPV DNA was amplified using biotinylated PGMY L1 consensus primer. To determine specimen adequacy, a fragment of the human β-globin gene was co-amplified with primers BGH20 and BPC04.
HPV DNA detection and genotyping
HPV detection and genotyping was performed on the products of PCR (inverse hybridization) which utilized the nylon membranes that were used for the hybridization. Each membrane contained 39 test lines, 37 of which correspond to type-specific HPV and two to the quantification of low and high concentrations of β-globin. HPV types that were considered high-risk for the development of cervical neoplasia are 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 66; low-risk are 6, 11, 26, 40, 42, 53, 54, 55, 61, 62, 64, 67, 68, 69, 70, 71, 72, 73, 81, 82, 83, 84, IS39, CP6108. The hybridization bands were detected using colorimetry. Membranes were interpreted using acetate that indicated the position of each HPV type. Hybridization results were independently interpreted by two reviewers. In addition, for the purpose of analysis, β-globin-negative samples that were PCR positive to HPV were considered as positive, given that competition between oligoelements from the diagnostic strips could result in a β-globin-negative specimen.
A stratified analysis was conducted by sex and a socioeconomic level index (SLI) was created using principal component analysis with the variables education, floor material in the dwelling, availability of potable water, drainage availability, owning a vehicle and owning domestic electronic equipment such as a television, video cassette recorder, gas stove and water heater. The index obtained was categorized in tertiles to define low, medium, and high SLI. The McNemar's test was used to compare the prevalence of HPV among men and their sexual partners.
The concordance of HPV status between sexual partners and between HPV risk groups (high- and low-risk) was evaluated based on contingency tables using the Kappa statistic. Concurrence of HPV infection in heterosexual couples was defined as the presence of infection in both of the sexual partners, independently of whether or not there was HPV type concordance. For couples where both partners presented with at least one type of HPV infection, percentages for type-specific positive concordance were obtained and, for those with type-specific concordance, it was determined whether the partners were concordant for one type, two types, or three types. The association of potential determinants of HPV positivity in both men and women was evaluated using logistic regression modeling adjusted for age and SLI, obtaining odds ratios (OR) with 95% confidence intervals. All p-values were two-sided.
Results and Discussion
Prevalence and concordance of HPV infection in sexual couples
The prevalence of HPV infection was 20.4% in men and 13.7% in women. The most frequently detected high-risk types were HPVs 59, 18, 39 and 16 among men, and HPVs 59, 16, 31, 52 and 58 among women. The most common low-risk types were HPVs 61, 62, 53, 84 and 81 among men, and HPVs 62, 71, 81 and 54 among women. Overall, the pattern of HPV type distribution was similar among men and women (Table 1 and Figure 1).
Concordance of HPV status was 79%. In 138 couples of the 504 included in the study, at least one of the respective partners had some type of HPV infection (27.4%). In 69(50%) of these only the man presented some type of infection, in 35(25.4%) only the woman, and in 34(24.6%) both were infected. Among heterosexual couples in which both partners were infected, 21(61.8%) showed type-specific concordance in one or more HPV types. Overall concordance was statistically significant (Kappa = 0.28, p < 0.001). The most frequent HPV types found in both partners who presented type-specific concordant infection were HPVs 59, 62, 54 and 39 (Table 2).
Determinants of HPV infection
In the study population, 69.4% of the couples lived in a rural area, 79.4% were married or living together, and 85.3% were Catholic. The median age for men was 38 years old and for women, 35 years. Seventy-four percent of men and 73% of women had nine or less than nine years of schooling. Forty-five percent of the men and 14% of the women were current smokers. A multiple logistic regression analysis, adjusted for age and SLI, indicated that among men, living in an urban area was significantly associated with an increased risk of penile HPV infection (OR 1.7, 95%CI 1.1 - 2.7) compared to living in a rural area. In addition, being single (OR 1.9, 95%CI 1.1 - 3.2) and having less than 7 years of schooling (OR 1.8, 95%CI 1.0 - 3.4) were variables significantly associated with an increased risk for penile HPV infection. For women, not having a stable partner was associated with a statistically significant increase in the risk of cervical HPV infection (OR 2.8, 95%CI 1.6 - 5.0), as was being a current smoker (OR 2.0, 95%CI 1.03 - 3.7). Age, years of schooling, SLI, and religion were not associated with the presence of cervical HPV infection in women (Table 3).
Sexual behavior characteristics associated with the presence of HPV infection
Forty-eight percent of the men reported having three or more lifetime sexual partners; Compared with 9% among women. The median number of sexual intercourses per month among the partners was eight, 29% of partners reported having sexual relations between 11 and 30 times a month. Thirty-seven percent of the men and 33% of the women reported having had anal sexual relations. Circumcision was confirmed in 7% of the male participants. Among men, initiating active sexual life before the age of 18 was positively associated with current penile HPV infection (OR 1.6, 95%CI 1.0 - 2.5) as was having had 10 or more lifetime sexual partners (OR 2.5, 95%CI 1.3 - 4.8), a history of having had sexual relations with prostitutes (OR 1.7, 95%CI 1.01 - 2.8) and not using condoms on a regular basis when having relations with prostitutes (OR 1.8, 95%CI 1.0 - 3.2) (Table 3). The percentage of men reporting having had two or more current regular sexual partners was 13.7%, 44.6% reported having had sexual intercourse with occasional partners, 21.6% with prostitutes, and 13.9% had maintained sexual relations with prostitutes while maintaining sexual relations with their regular partner (data not shown).
Among women, 4% had never been pregnant, 37.3% never had a cervical cytology, and 29.4% did not use any contraceptive method. An increased risk of cervical HPV infection was observed (OR 1.9, 95%CI 1.01 - 3.7) in women whose male partners had sexual relations with prostitutes while living together, as was for those whose partners did not use condoms while having relations with prostitutes (OR 1.9, 95%CI 1.0 - 3.6). In women, no statistically significant associations were found between sexual behavior characteristics and HPV detection (data not shown).
The presence of any HPV type infection in men was strongly associated with the presence of HPV infection in their female sexual partners (OR 5.1, 95%CI 3.0 - 8.8) (Table 4).
This work describes one of the first studies in a Mexican population that evaluates HPV type-specific concordance among heterosexual couples in a rural area in central Mexico. Of 138 couples where at least one partner was infected, approximately 25% (34/138 = 24.6) of the respective partners were simultaneously infected by HPV. Among these couples, type-specific concordance was high (61.8%). The principal predictors of HPV in men were factors related to high-risk sexual behavior. The presence of HPV in both men and women was strongly associated with the detection of HPV in their respective partners.
Studies over the past 20 years evaluating HPV infection concordance among heterosexual partners have shown many inconsistencies, reporting concordances of type-specific infection of between 2 and 87%[5, 6, 8, 16–21]. Such heterogeneous findings may be due to the use of diverse laboratory HPV DNA detection techniques, the methods used to select the study population, and to the anatomical site being sampled (particularly in men), among other factors.
An early report on HPV concordance in heterosexual partners documented that 75% of women whose male partners had HPV were also HPV positive, while only 39% of men with HPV-positive female partners were HPV positive in semen. Female partners of men with condylomatosis of the penis have also been studied, where high-risk cervical HPV has been calculated to be 27.7% and cytologic anomalies in the cervix has been estimated to be 36%. The main limitation of previous studies was primarily methodological. Technological developments over the years in the area of diagnostic testing have led to more sensitive HPV DNA detection tests. Furthermore, the identification of male anatomical regions where HPV is routinely detected has recently been well studied. Therefore, comparisons between population studies are greatly limited due to differences in the methods employed.
Other studies have recently shown concordance findings to be similar to those found in this study; 76% of male partners of infected women have been shown to be HPV positive. Three other studies evaluating type-specific concordance in heterosexual partners reported concordance estimates of 43% a 64.4%, although the sample size was quite small[8, 19, 24]. These results are consistent with the hypothesis of sexual transmission[25, 26] of HPV infections.
An association between the presence of lesions in the sexual partner and the presence of HPV infection was not demonstrated in the current study as the large proportion of infections in this population was subclinical. It is possible that the combined sampling of sites of the scrotum and penile shaft, balano-preputial lamina and urinary meatus has increased the type-specific concordance value found in this study. It has been shown in a previous study that use of combined samples increases HPV DNA detection.
The 13.7% prevalence of HPV infection found in women is less than the prevalence of 20.4% found in men; this lower prevalence in women compared to their male partners has been observed in other studies that evaluate both men and women. The natural history of HPV infection may be different between men and women due to differences between the epithelium in the cervical transformation zone and the penis. HPV DNA prevalence has been shown to be as much as two to three times higher in Mexican men than in Mexican women. With respect to women, HPV prevalence in Mexico has been reported as ranging from as little as 3.7% to as high as 48.9%[28–33] and a systematic review conducted in the United States that includes studies of prevalence in Hispanic, African-American, Asian, Caucasian and other women report prevalences between 14% and 90%. Higher HPV prevalence estimates have been observed among women with high-risk sexual behavior as compared to predominantly monogamous women. This is consistent with prevalence estimates derived from a population-based study of Mexican women and those from a study of women with social security health care services[30, 32]. In addition, prevalence estimates in urban areas, where HPV is endemic, are greater than those observed among women in rural areas and than those observed in countries with a low incidence of and mortality from cervical cancer. The bimodal pattern for HPV infection by age group observed in previous studies of populations with elevated mortality due to cervical cancer[28, 37] was not observed in this study of rural women, showing an elevated prevalence of more than 14% in women older than 30 years, which was consistent up to 75 years of age, the maximum age included.
The above is a reflection of the fact that HPV prevalence of and concordance among couples is not only highly variable but also depends on the sexual behavior of the couples, the sensitivity of the tests employed, and more importantly on the differences between acquisition rates among men and women.
The identification of risk factors associated with HPV detection in our study in both men and women is consistent with that of other reports[38–48]. In men, being single and having fewer years of schooling are associated with an increased risk for HPV infection, as is being younger on sexual debut, having multiple sexual partners, and a history of having had sexual relations with prostitutes. This pattern of risk factors for penile HPV infection is similar to that found in an HPV study among Mexican soldiers. For women, being single and smoking are factors clearly correlated with high-risk sexual conducts and are therefore positively associated with HPV infection, a finding that is also consistent with reports from previous studies[32, 37]. In the present study, we show for Mexican men that a history of sexual relations with sex workers and inadequate use of condoms when having such sexual relations increase the risk of HPV infection in their female partners, indicating, as in many other studies, the key role of the male factor in the risk of HPV infection in the female partner.
The results of this study of couples are singularly important, in part, because this is one of the first studies to quantify type-specific HPV concordance for a female population with a pattern of sexual conduct that is predominantly monogamous. In addition, because HPV prevalence estimates in the external male genitalia was found to be two times higher than that previously reported for Mexican men with low-risk sexual behavior. These findings are bolstered by an external quality control mechanism for the determination of HPV DNA in the study population that included a determination of HPV blind to knowledge of gender and of the HPV results of the corresponding partner. Therefore, information bias with regard to the characterization of the presence of HPV DNA is improbable.
Prospective cohort studies among different populations are warranted to confirm these estimates as well as to quantify the probability of HPV transmission patterns in men and women and explore the role of potentially associated cofactors.
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We thank Pilar Hernández for assistance in the HPV laboratory. In addition to the participants who made this study possible, we thank the staff at participating institutions, included Local Health Services of Mexico, State who were involved with the conduct of this epidemiologic project for their dedicated efforts which were essential for its successful completion.
Financial support: Conacyt (2002-C01-7800)
This research has been conducted in compliance with all applicable federal regulations governing the protection of human subjects in research. The findings and conclusions in this report are those of the authors and do not necessary represent the official position of the National Institute of public Health of Mexico.
Reprints or correspondence: Eduardo Lazcano-Ponce, Centro de Investigación en Salud Poblacional, Instituto Nacional de Salud Pública, Av. Universidad 655. Col. Santa María Ahuacatitlán. C.P. 62508, Cuernavaca, Morelos, México. Phone: 52-777-329-3003; Fax:52-777-311-1148/2219. E-mail:email@example.com.
The authors declare that they have no competing interests.
RP participated in the design of the study, supervised the trial and data acquisition process, RM performed the statistical analysis, interpreted the data and wrote this paper, ARG and XC analyzed and interpreted the data, AC participated in the design of the study, ELP conceived of the study, participated in its design, coordination and wrote this paper. All authors read and approved the final manuscript.
An erratum to this article is available at http://dx.doi.org/10.1186/1471-2334-11-25.
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Parada, R., Morales, R., Giuliano, A.R. et al. Prevalence, concordance and determinants of human papillomavirus infection among heterosexual partners in a rural region in central Mexico. BMC Infect Dis 10, 223 (2010). https://doi.org/10.1186/1471-2334-10-223
- Sexual Partner
- Heterosexual Couple
- Regular Sexual Partner
- Sexual Couple
- Heterosexual Partner