MEM INST OSWALDO CRUZ, RIO DE JANEIRO, 97(8) December 2002
PAGES: 1073-1077 DOI: Full paper
Prevalence of Chlamydia trachomatis in Human Immunodeficiency Virus-infected Women in Cuba

Vivian Kouri +, Judith Cartaya, María E RodríguezI, Mayra Muné, Yudira Soto, Sonia Resik, Jose BravoII, Alina LlopIII

Departamento de Virología
IDepartmento de Dermatología
IIDepartmento de Bioestadística
IIISub-directora de Microbiología, Instituto de Medicina Tropical "Pedro Kouri", Autopista Novia del Mediodía, km 6, La Lisa, Ciudad de la Habana, Cuba

Abstract

To determine the prevalence rates and serovar distribution of Chlamydia trachomatis cervical infections in Cuban women, two different groups were selected. Group I consisted of 60 human immunodeficiency virus (HIV-1) seropositive women from different regions of Cuba and group II of 60 randomly selected women HIV seronegative and apparently healthy. C. trachomatis was detected in cervical scrapes by mean of nested polymerase chain reaction (PCR) specific for major out membrane protein. The overall prevalence rate of C. trachomatis in cervical scrapes determined by nested PCR was 10% in group I and the estimated prevalence was 6.6% for group II; 83.3% of HIV seropositive women with C. trachomatis infection reported history of pelvic inflammatory disease followed by cervicitis (50%). The control group C. trachomatis-infected women referred a history of cervicitis in 75% of cases. Other reports in the latter group included infertility and pelvic inflamatory disease in 50%. The present study is the first report of C. trachomatis prevalence in Cuba. It showed that there was not significantly difference in the prevalence rate of C. trachomatis between both groups.

Chlamydia trachomatis is a ubiquitous microorganism and one of the most common agent of sexually transmitted infections (STI). The number of these infections is displaying an increasing tendency worldwide (Déak et al. 1997). The prevalence of C. trachomatis genital infections in women has been reported ranging from 0 to 37%, depending on the population studied and the techniques used (Lan et al. 1995, Assefa et al. 1998).

Several risk factors play a role in this tendency: age under 25, family status, education, beginning of sexual activity and number of sexual partner among others (Oakeshott & Hay 1995).

Genital infections produced by C. trachomatis mainly affect women, who develop cervical infections and urethritis, and a substantial number has an asymptomatic course (Adler 1996, Ramjee et al. 1998, Colvin et al. 1998). In adults, complications include infertility, pelvic inflamatory disease (PID), ectopic pregnancy, premature rupture of membranes, pre-term-birth, puerperal infections and facilitation of human immunodeficiency virus (HIV) type 1 transmission (Temmerman 1994, Chaisilwattana et al. 1997).

Currently, 16 serovars of C. trachomatis have been identified; 60 to 70% of urogenital syndromes are produced by serovars E, F and D (Naher & Petzoldt 1991, Paavonen 1996).

The polymerase chaim reaction (PCR) technology developed in recent years allows the detection of small quantities of specific nuclei acids and have been proposed by different authors as an alternative methodology for C. trachomatis diagnosis (Lan et al. 1995, Le Bar 1996).

In the present study, the prevalence rate of C. trachomatis infections was investigated in Cuban HIV-infected women and the estimated of prevalence in healthy seronegative women. Nested PCR was employed to amplify a large part of the major out membrane protein (MOMP) gene, and then cataloged restriction fragment length polymorphism (RFLP) to distinguish serovars of C. trachomatis.

 

MATERIALS AND METHODS

Study population - The present study was performed from November 1996 to March 1997 at the Institute of Tropical Medicine "Pedro Kouri" (IPK). At the moment of the study there were 350 HIV-1 infected women in Cuba. Two different populations were investigated for the prevalence of C. trachomatis cervical infections. Group I consisted of 60 HIV-1 seropositive women randomly selected from the National Registry of HIV patients in Cuba, and the selected patients agree to participate in the study. All patients from distant regions of the country were transported to the IPK for testing. The random selection was made by means of a table of random number using a simple random sample method. Group II consisted of 60 HIV seronegative women apparently healthy who were invited to participate in this study as control group; they were selected from IPK workers as well as from mothers who bring their children to the outpatient service of the Institute. This group was mainly composed of individuals from Havana City, although 12 (20%) came from other cities.

Both groups ranged between 15 to 50 years of age. They were requested to complete an anonymous questionnaire regarding previous gynecological history (infertility, PID, cervicitis, among others) as well as some epidemiological data (age, number of sexual partners) and afterward they were carefully physically examined. An HIV test was performed to each seronegative woman at the first visit, and CD4 count was determined to all HIV seropositive women.

The study has institutional ethics approval and all patients read the informed consent.

Sample collection and processing - Cervical scrapes were collected with cervix brushes, placed in 1 ml of media (phosphate-buffered saline, PBS 1X pH 7.2 and SDS 0.001%, Dygene) and transported to the laboratory. The samples were centrifuged at 3200 x g and the pellet was suspended in 500 µl of digestion buffer (Tris 10mM, EDTA 10mM, SDS 0.5%, NaCl 10mM) and 10 µl of proteinase K (20 mg/ml) and incubated at 56oC for 1 h. Finally, DNA was extracted with phenol-chloroform, ethanol precipitated and the pellet was resuspended in 10 µl of distilled water, according to the protocol described by Innis et al. (1990), 5 µl were used for the first reaction of nested PCR.

Nested PCR was first normalized using dilutions from pure to 10-10 of L2 strain (ATCC) previously tittered in tissue culture (Mc Coy Cells) which is the gold standard, in order to detect the number of inclusions forming units (IFU).

The primers used for the first reaction of nested PCR flanking a region of 1200 bp from the MOMP gene while the second nested pair of primers were used to amplify a inner 305 bp fragment from the same gene (Hayes et al. 1992). Negative and positive controls were also tested in each assay; they had been confirmed as positive or negative by tissue culture. We also employed distilled water as negative control, they were placed each five samples in order to check for cross-contamination between samples during the performance of the nested-PCR. Ten microliters of amplified products from the nested primer pair was analyzed on 2% agarose gel electrophoresis stained with ethidium bromide.

Once the amplified fragments were visible at the gel, nested PCR products were subjected to RFLP analysis using Alu I and Msp I (Promega) enzymes as described previously (Frost et al. 1993). The digestion products were separated on 10% polyacrilamide gel in Tris-Borate buffer. Gel were ethidium bromide stained in order to see the bands.

All patients were also tested for other microorganisms that produce STI. For human papillomavirus (HPV) detection andmycoplasma (Ureaplasma urealiticum) PCR was employed (Manos et al. 1989, Teng et al. 1994), while for Neisseria gonorrhoeae, Trichomonas vaginalis, and Candida albicans, culture of the microorganisms was the technique assayed (Thayer & Martin 1966, Fleming et al. 1977, Fouts & Kraus 1980). For Treponema pallidum VDRL was the technique employed.

Statistic analysis - Data management was performed by the statistical program package Microstat and Chi-square statistical analysis with Yate correction; 95% confidence interval was tested to ascertain whether the results were statistically significant. Odd Ratio was calculated for relative risk determination (Fleis 1981, Dawson & Trapp 1993).

 

RESULTS

PCR normalization, DNA extraction and PCR assay - The sensitivity of PCR was determined using dilutions from pure to 10-10 of C. trachomatis L2 strain previously tittered in tissue culture in order to detect the number of IFU. By mean of tissue culture we detected 1 IFU in 10-5 dilution of C. trachomatis L2 strain. Our PCR system resulted more sensitive than tissue culture, since it was able to detect 0.1 IFU L2 DNA.

Of the 120 cases that were screened for C. trachomatis MOMP PCR, 10 (8.3%) were found positive.

Prevalence - The overall prevalence rate of C. trachomatis in cervical scrapes determined by PCR was 10% (6 cases) in group I and the estimated prevalence was 6.6% (4 cases) for group II (95% CI). The C. trachomatis positive scrapes detected by MOMP nested PCR were genotyped by RFLP analysis. Serovar E was found in six cases from both groups whereas serovar L2 was found in one HIV seropositive woman.

Epidemiological characteristics and risk factors - Epidemiological data and risk factors for C. trachomatisbetween HIV seropositive and seronegative women are shown in the Table. HIV seropositive women withC. trachomatis tended to be younger than those without this infection, being statistically significant, although this finding was only present for group I.

In contrast, primigravida status and history of multiple sexual partners in the last five years was not significantly related to C. trachomatis infection.

The number of HIV seropositive women positive to C. trachomatis was associated with VDRL positive. Other factors, including CD4 count, hepatitis B surface antigen (HBsAg) and hepatitis C antibodies (HCV) were not significantly associated with this infection.

Aiming to make an analysis of the data collected in the questionnaire related to gynecological history referred by patients we concluded that the main complains among the group I with C. trachomatis infection was PID (5 out of 6 cases, 83.3%), followed by cervicitis in 3 cases (50%). In contrast, group II referred history of cervicitis in 3 cases (75%). Other report in the latter group included infertility and PID in 2 cases (50%).

At physical exam, cervicitis and vaginal discharge were present in 2 (33.3%) and 1 (16.6%) respectively in HIV infected women with C. trachomatis infection while for HIV seronegative women C. trachomatis-infected were present in 3 (75%) and 1 (25%) case respectively. Otherwise, there was a proportion of asymptomatic cases.

C. trachomatis and other pathogens co-infection - The association of C. trachomatis in HIV seropositive and seronegative women with other pathogens also tested during this study is summarized as follow. In HIV seropositive women we found 22 positives to T. vaginalis, but only 1 was also positive to C. trachomatis (16.6%), from 18 positives to C. albicans 2 resulted positives to C. trachomatis (11.1%) and 5 out of 34 cases positives to HPV (14.7%); only HIV seropositive women positives to C. trachomatis and VDRL (2 of 5 cases; 40%) resulted statistically significant. For HIV seronegative group there was no significant relation between C. trachomatis and any other pathogen, but we should remark that HPV and C. albicans infection were frequently detected (30 and 19 cases respectively).

 

DISCUSSION

PCR technology has been successfully employed during the last ten years for diagnosis of several microorganisms. Many studies related to C. trachomatis prevalence using PCR from cervical scrapers or urine have been done (Frost et al. 1991, 1993, Poulin et al. 2001, Garland et al. 2001), obtaining similar results. Other authors have compared for accuracy several methods like tissue culture or antigen detection with PCR and all of them have obtained excellent results with the latter, which has proven to have more sensitivity than tissue culture. It is also in agreement with the results that we obtained when our nested PCR was normalized (Cheng et al. 2001).

The present study demonstrated that the prevalence of C. trachomatis in HIV positive women in Cuba is higher but not significantly different from the estimated prevalence in the control group (p > 0.05). Those results are similar to other previous reports of prevalence in asymptomatics cervical infections, which range from 0 to 37% (Déak et al. 1997, Assefa et al. 1998). Other authors in France and Spain reported prevalence rates of 7.1 and 6.3% respectively, being similar to the prevalence estimated for control group (Massé et al. 1991, García-Lechuz et al. 1999).

Few published reports regarding the prevalence of C. trachomatis in HIV positive women were found in the reviewed literature. In 1994, Spinillo et al. referred an 18.3% of prevalence rate in HIV infected women, which resulted significantly higher to the prevalence obtained in the control group that was 8%. Anyway, they could not find any correlation between immunodepression and, similar to us, they did not find differences in the risk of development C. trachomatis infection cervical infection among HIV seronegative and seropositive women. Christenson and Stilstrom, in 1995, studied some STD in Sweden and they considered that, in contrast to other STI, C. trachomatis was the only agent affecting the population in the same way, including HIV women, this result is in agreement with our results. Minkoff et al. (1999) and García-Lechuz et al. (1999) reported similar results in recent studies.

In a similar way, Clark et al. (1993) and Calore et al. (1995) studied the behaviour of different STD in HIV infected patients, reporting prevalence rates of 12.3% and 3.4% respectively. Similar to previous studies (Douvier et al. 1996, Passey et al. 1998), we found significant relation between age under 25 and C. trachomatis infection, but it was only present for group I. CD4 count was low (less than 500 cells/ml) in 48 out of the 60 HIV infected patients, but it was not related to C. trachomatis infection, based in our results we do not consider C. trachomatis infection to be directly related to the immune status.

We found PID and cervicitis as the predominant diseases referred by patients in the gynecological history recorded in the questionnaire in C. trachomatis infected women both seronegative and seropositive to HIV and also at physical exam. Those data are in agreement with previously published report. Paavonen et al. (1987, 1996) reported that C. trachomatis is one of the principal causes of PID and cervicitis.

Two women belonging to the control group referred infertility and both resulted infected with C. trachomatis, similar results have been found by other authors (Videla et al. 1994, Gao et al. 1995, Swasdio et al. 1996). In agreement with most of the literature reported, related to the symptomatic course of mostC. trachomatis infection (Spinillo et al. 1994, Colvin et al. 1998) we demonstrated that a proportion of HIV seropositive women did not have any sign or symptoms at physical exam. Nevertheless it did not happen in the control group where all patients had positive physical exam.

We should take into account that many cases with negative results to C. trachomatis infection also presented a positive gynecological exam as well as symptoms recorded at the questionnaire; this could be explained due to the presence of other STI pathogens different of C. trachomatis such as Ureaplasma urealyticum, T. vaginalis, N. gonorrhoeae and C. albicans among others (Lan et al. 1995,German et al. 1997, Garland et al. 2001). Those agents were also tested in our study and we could detect that HPV andC. albicans were very frequent for HIV infected women and mycoplasma (U. urealiticum) for non-HIV group. Nevertheless there was no association between C. trachomatis and any other infection.

The C. trachomatis serovar was determined by RFLP analysis of the amplified nested PCR products, but only 7 cases could be typed, the other 3 were weakly positive and we were unable of typing them. Serovar E was present in 6 cases, which is in agreement with previously published report (Frost et al. 1991, 1993, Lan et al. 1995) that considers this serovar as the most frequently detected in endocervical samples (about 40% of cases). Typing of C. trachomatis by mean of RLFP is a useful tool for epidemiological studies.

The present study is the first report of C. trachomatis prevalence in Cuba. It shows that not significant difference in the prevalence rate of C. trachomatis genital infection between both groups was found and serovar E was the most frequently detected. Patients referred history of PID, cervicitis and infertility. Cervicitis was the main clinical finding at gynecological exam and there were a proportion of asymptomatic patients. Strategies to detect and treat genital infections need to be developed.

 

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