[Detection of Chlamydia abortus in bovine reproductive losses in the province of La Pampa, Argentina]. / Detección de Chlamydia abortus en pérdidas reproductivas de bovinos en la provincia de La Pampa, Argentina.

Reproductive losses linked to an infectious etiology in bovine cattle are a major economic concern worldwide. In Argentina, more than 50% of abortion cases have unknown causes. Species belonging to Chlamydiaceae family are frequent etiologic agents of abortion around the world; however, there is yet no information on their prevalence in Argentina. The objective of this work was to identify Chlamydia spp., and particularly C. abortus in reproductive losses from bovine cattle in La Pampa, Argentina. Real time PCR targeting Chlamydiaceae-specific DNA fragments was performed on 251 samples obtained from bovine abortions and stillborns, and ArrayTube was used for species identification on positive samples. Chlamydiaceae DNA was detected in 12 samples of aborted fetuses (4.78%), 83.33% (10/12) accounting for abortions and 16.66% (2/12) for stillborns. C. abortus was detected by ArrayTube in 5 cases (1.99% of all samples, and 41.67% of Chlamydiaceae positive samples). This study shows the first detection of Chlamydiaceae and C. abortus DNA on reproductive losses of bovine cattle in Argentina, and the described prevalence value (4.78%) should be taken as baseline value due to the type of samples analyzed. Detection of genetic material from Chlamydiaceae not matching any of the studied species could be due to intraspecies variants or local species not yet described. Further research on Chlamydia infections in bovine cattle in Argentina is imperative to describe their range, to analyze their economic and zoonotic implications and to make recommendations about prevention and control measures.

High Frequency of Chlamydia trachomatis Mixed Infections Detected by Microarray Assay in South American Samples.

Chlamydia trachomatis is one of the most common sexually transmitted infections worldwide. Based on sequence variation in the ompA gene encoding the major outer membrane protein, the genotyping scheme distinguishes 17 recognized genotypes, i.e. A, B, Ba, C, D, Da, E, F, G, H, I, Ia, J, K, L1, L2, and L3. Genotyping is an important tool for epidemiological tracking of C. trachomatis infections, including the revelation of transmission pathways and association with tissue tropism and pathogenicity. Moreover, genotyping can be useful for clinicians to establish the correct treatment when LGV strains are detected. Recently a microarray assay was described that offers several advantages, such as rapidity, ease of standardization and detection of mixed infections. The aim of this study was to evaluate the performance of the DNA microarray-based assay for C. trachomatis genotyping of clinical samples already typed by PCR-RFLP from South America. The agreement between both typing techniques was 90.05% and the overall genotype distribution obtained with both techniques was similar. Detection of mixed-genotype infections was significantly higher using the microarray assay (8.4% of cases) compared to PCR-RFLP (0.5%). Among 178 samples, the microarray assay identified 10 ompA genotypes, i.e. D, Da, E, F, G, H, I, J, K and L2. The most predominant type was genotype E, followed by D and F.

Comparison of multilocus sequence typing and multilocus typing microarray of Chlamydia trachomatis strains from Argentina and Chile.

This study compared conventional ompA genotyping of Chlamydia trachomatis with multilocus sequence typing (MLST) and multilocus typing (MLT) DNA microarray. DNA extracts of 104 C. trachomatis positive specimens were analyzed by ompA sequencing and MLST and of these 76 by MLT array. Obtained MLST sequence types (STs) were compared to sequences in the database http://mlstdb.uu.se. The resolution obtained for MLST (35 STs) was 2.1 higher than for ompA sequencing (17 variants) and 1.3 higher than MLT array (27 MLT groups). Among the 104 samples the predominant genotype E could be divided into 5 ompA variants and 23 STs of which 16 had not been reported in previous studies. The most common STs, ST3 and ST56, were identified as founders and are common in several countries on a global scale. The MLST and the MLT array provided similar strain discrimination capacity and showed considerably higher resolution than conventional ompA sequencing.

Prevalencia de disfunción vaginal en mujeres de la ciudad de Bahía Blanca (Argentina) / Vaginal dysfunction prevalence in women of the city of Bahía Blanca (Argentina) / A prevalência de disfunção vaginal em mulheres da cidade de Bahía Blanca (Argentina)

La disfunción vaginal (vaginosis/vaginitis) es la patología genital hoy reconocida más prevalente. El objetivo del trabajo fue generar información sobre la prevalencia de Disfunción vaginal y los factores de riesgo asociados en mujeres sintomáticas y asintomáticas. Se incorporó además la detección de C. trachomatis y N. gonorrhoeae. Se consolida la validez del Balance del Contenido Vaginal (BACOVA) en el diagnóstico integral de disfunción vaginal y de la amplificación génica en la detección de C. trachomatis. Se estudiaron 295 mujeres que asistieron al Hospital Municipal de Bahía Blanca. La mayor prevalencia correspondió a vaginosis bacteriana (21,36%), luego levaduras (13,90%), T. vaginalis (3,73%) y C. trachomatis (3,05%). No se detectó ningún caso de gonococia. Los factores de riesgo encuadran en el marco de valores de la región centro sur del país, pero se debe destacar la frecuencia significativa de alteraciones de la función vaginal (68,87%) y la infección por clamidias (4,35%) detectadas en mujeres asintomáticas. Esto impone la necesidad de revisar y optimizar la política de cumplimiento de las Normas Ministeriales de prevención y control con la aplicación de una metodología de laboratorio normatizada en el protocolo de control de mujeres en edad fértil, embarazadas o no.

Vaginal dysfunction (vaginosis/vaginitis) is the most prevalent genital pathology recognized today. The objective of the work was to generate information on the prevalence of vaginal dysfunction and the associated risk factors in symptomatic and asymptomatic women. The detection of C. trachomatis and N. gonorrhoeae was also incorporated. The validity of the Vaginal Content Balance (BACOVA) in the comprehensive diagnosis of vaginal dysfunction and of gene amplification in the detection of C. trachomatis is consolidated. A total of 295 women who attended the Municipal Hospital of Bahía Blanca were studied. The highest prevalence corresponded to bacterial vaginosis (21.36%), then yeasts (13.90%), T. vaginalis (3.73%) and C. trachomatis (3.05%). No cases of gonorrhea were detected. The risk factors fit within the framework of values of the south central region of the country, but the significant frequency of alterations of vaginal function (68.87%) and chlamydial infection (4.35%) detected in asymptomatic women should be noted. This imposes the need to review and optimize the compliance policy of the Ministerial Standards of prevention and control, with the application of a standardized laboratory methodology, in the control protocol for women of childbearing age, pregnant or not.

A disfunção vaginal (vaginose/vaginite) é a patologia genital mais prevalente hoje reconhecida. O objetivo do trabalho foi gerar informações sobre a prevalência de disfunção vaginal e os fatores de risco associados em mulheres sintomáticas e assintomáticas. A detecção de C. trachomatis e N. gonorrhoeae também foi incorporada. A validade do Equilíbrio do Conteúdo Vaginal (BACOVA) no diagnóstico integral da Disfunção Vaginal e da amplificação gênica na detecção de C. trachomatis está consolidada. Estudamos 295 mulheres que freqüentaram o Hospital Municipal de Bahía Blanca. A maior prevalência correspondeu à vaginose bacteriana (21,36%), depois leveduras (13,90%), T. vaginalis (3,73%) e C. trachomatis (3,05%). Nenhum caso de gonorreia foi detectado. Os fatores de risco enquadram-se no quadro de valores da região centro-sul do país, mas deve-se notar a frequência significativa de alterações da função vaginal (68,87%) e infecção por clamídia (4,35%), detectadas em mulheres assintomáticas. Isso impõe a necessidade de rever e otimizar a política de compliance das Normas Ministeriais de prevenção e controle, com a aplicação de metodologia laboratorial padronizada, no protocolo de controle para mulheres em idade fértil, gestantes ou não.

Detección de Chlamydia abortus en pérdidas reproductivas de bovinos en la provincia de La Pampa, Argentina / Detection of Chlamydia abortus in bovine reproductive losses in the province of La Pampa, Argentina

Las pérdidas reproductivas constituyen una causa importante de pérdida económica en el ganado bovino, aunque en más del 50% de los casos la etiología es desconocida. Las especies de la familia Chlamydiaceae han sido asociadas con abortos en bovinos y otras espeChlamydia abortus; cies animales, pero no existen datos al respecto en la República Argentina. El objetivo de este trabajo fue determinar la presencia de Chlamydia spp. y de Chlamydia abortus en pérdidas reproductivas de ganado bovino en La Pampa, Argentina. Se estudiaron 251 muestras provenientes de abortos y mortinatos. Se realizó PCR en tiempo real para la detección de la familia Chlamydiaceae y ArrayTube para la identificación de las especies presentes. Se detectó ADN de la familia Chlamydiaceae en 12 muestras (4,78%); el 83,33% (10/12) correspondió a abortos y el 16,66% (2/12) a mortinatos. El análisis por ArrayTube detectó C. abortus en 5 muestras (1,99% del total, 41,67% de las muestras con detección de Chlamydiaceae). Este trabajo presenta la primera confirmación de la presencia de ADN de diversas especies de Chlamydiaceae (incluida C. abortus) en muestras de pérdidas reproductivas de ganado bovino en Argentina. El valor de prevalencia hallado (4,78%) debe ser tomado como un valor basal, debido al tipo de muestras estudiadas. Se halló material genético de Chlamydiaceae que no coincidió con ninguna de las especies conocidas; esto podría deberse a variantes intraespecie o a especies autóctonas aún no descriptas. Es necesario avanzar en el estudio de la infección por estas bacterias en el ganado bovino de Argentina para conocer su dimensión y analizar su impacto económico y zoonótico, y también para planear medidas de prevención y control.

Reproductive losses linked to an infectious etiology in bovine cattle are a major economic concern worldwide. In Argentina, more than 50% of abortion cases have unknown causes. Species belonging to Chlamydiaceae family are frequent etiologic agents of abortion around the world; however, there is yet no information on their prevalence in Argentina. The objective of this work was to identify Chlamydia spp., and particularly C. abortus in reproductive losses from bovine cattle in La Pampa, Argentina. Real time PCR targeting Chlamydiaceae-specific DNA fragments was performed on 251 samples obtained from bovine abortions and stillborns, and ArrayTube was used for species identification on positive samples. Chlamydiaceae DNA was detected in 12 samples of aborted fetuses (4.78%), 83.33% (10/12) accounting for abortions and 16.66% (2/12) for stillborns. C. abortus was detected by ArrayTube in 5 cases (1.99% of all samples, and 41.67% of Chlamydiaceae positive samples). This study shows the first detection of Chlamydiaceae and C. abortus DNA on reproductive losses of bovine cattle in Argentina, and the described prevalence value (4.78%) should be taken as baseline value due to the type of samples analyzed. Detection of genetic material from Chlamydiaceae not matching any of the studied species could be due to intraspecies variants or local species not yet described. Further research on Chlamydia infections in bovine cattle in Argentina is imperative to describe their range, to analyze their economic and zoonotic implications and to make recommendations about prevention and control measures.

Distribution study of Chlamydia trachomatis genotypes in symptomatic patients in Buenos Aires, Argentina: association between genotype E and neonatal conjunctivitis.

BACKGROUND: Chlamydia trachomatis infections are the most prevalent sexually transmitted bacterial infections in the world. There is scarce data available referring to the distribution of C. trachomatis genotypes in Argentina. The aim of this study was to identify the genotypes of C. trachomatis circulating in the metropolitan area of Buenos Aires (Argentina) associated with ophthalmia neonatorum and genital infections. FINDINGS: From 2001 to 2006, 199 positive samples for C. trachomatis infection from symptomatic adult patients and neonates with ophthalmia neonatorum from two public hospitals were studied. C. trachomatis genotypes were determined by PCR-RFLP of an ompA fragment.Genotype E was the most prevalent regardless of the sample origin (46.3% 57/123 in adults and 72.4% 55/76 in neonates), followed by genotype D (19.5% 24/123) and F (14.6% 18/123) in adults, and G (9.2% 7/76) and D (7.9% 6/76) in neonates. We detected a significantly higher frequency of genotype E (p < 0.001, OR = 3.03 (1.57