Factors associated with Trichomonas vaginalis infection in reproductive-aged women attending cervical screening in southeast of Brazil

ABSTRACT Background: Sexually Transmitted Infections (STIs) can be caused by viruses, bacteria, and parasites. The World Health Organization estimated more than 300 million new global cases of curable STIs among individuals of reproductive age. Infection by Trichomonas vaginalis is one of the most prevalent curable STL Despite the current treatments available, the diagnosis of T. vaginalis can be difficult, and the resistance to the treatment increased concern for the healthcare system. Objectives: The aim of this study was to determine the prevalence and factors associated with Trichomonas vaginalis infection among women of reproductive age attending community-based services for cervical screening. Patients and methods: A total of 1477 reproductive-aged women attending 18 Primary Health Care Units in Botucatu, Brazil, from September to October 2012, were enrolled. A structured questionnaire was used for individual face-to-face interviews for obtaining data on sociodemographic, gynecologic, and obstetrics history, sexual and hygiene practices, among others. Cervicovaginal samples were obtained for detection of T. vaginalis by culture using Diamond's medium and microscopic vaginal microbiota classification according to Nugent. A multivariable logistic regression analysis was carried out to estimate Odds Ratios (OR) and 95% Confidence Intervals (95% CI) for the association between participants' sociodemographic, behavioral factors, and clinical factors with T. vaginalis infection. Results: Median age of study participants was 33 years (ranging from 18 to 50). The overall prevalence of T. vaginalis infection was 1.3% (n = 20). Several factors were independently associated with T. vaginalis infection, such as self-reporting as black or Pardo for ethnicity (OR = 2.70; 95% CI 1.03-7.08), smoking (OR=3.18; 95% CI 1.23-8.24) and having bacterial vaginosis (OR = 4.01; 95%CI = 1.55-10.38) upon enrollment. A protective effect of higher educational level (having high school degree) was observed (OR = 0.16; 95% CI 0.05-0.53). Conclusions: Our data suggest that screening programs to correctly detect T. vaginalis infection can be helpful to guide prevention strategies to the community. Our study supports an association between abnormal vaginal microbiota and T. vaginalis infection.

Impact of microablative fractional radiofrequency on the vaginal health, microbiota, and cellularity of postmenopausal women

OBJECTIVES: We aimed to evaluate the effectiveness of microablative fractional radiofrequency (MAFRF) in the non-hormonal treatment of genitourinary syndrome of menopause. METHODS: We examined the cases of 55 postmenopausal women before and after treatment with regard to their vaginal health index (VHI), vaginal microbiota, vaginal pH, and cell maturation. Three applications of MAFRF were performed in the vagina/vaginal introitus. During the treatment, six vaginal smears were obtained and stained with the Papanicolaou stain for determining the degree of cell maturation and with Gram stain for classification of vaginal flora, as per the criteria of Spiegel and Amsel. For vaginal pH determination, pH indicator strips were applied against the vaginal wall. Statistical analysis was performed using SPSS for Windows (version 17.0). Data were reported as mean±standard deviation. The differences were analyzed using the statistical method of generalized estimation equations with autoregressive correlation structure "1" and robust standard errors. RESULTS: The mean age was 59.8±4.2 years, and the mean time of menopause was 15.4±4.5 years. After treatment, there was an increase in the percentage of Lactobacillus spp. (p<0.001). Consequently, there was a progressive decrease in vaginal pH during the treatment (p<0.001). Regarding cell maturation, there was a decrease in the percentage of parabasal cells (p=0.001) and an increase in the rate of superficial cells (p<0.001). Additionally, there was an improvement in the VHI index. The mean VHI values before and after treatment were 13.2±5.6 and 22.5±3.7, respectively (p<0.001). CONCLUSION: MAFRF treatment is well tolerated and leads to improvement in the vaginal microenvironment.

Detection of potentially pathogenic bacteria on cell phones of hospital and university-based populations in Curitiba, southern Brazil. A cross-sectional study

ABSTRACT BACKGROUND: Cell phones have become indispensable for professional activities, including healthcare. Thus, they are possible sources of bacterial contamination. There is a scarcity of data in the literature regarding identification of risk factors for contamination of cell phones with pathogenic bacteria. OBJECTIVE: To compare the prevalence rates of Staphylococcus aureus (S. aureus), methicillin-resistant S. aureus (MRSA) and/or Enterobacteriaceae on cell phones belonging to hospital healthcare staff and university students in Curitiba, Paraná, Brazil, and to identify variables associated with such contamination. DESIGN AND SETTING: Cross-sectional study conducted in a public university's referral hospital and lecture buildings in 2017. METHODS: We sampled the surface of cell phones using the dipslide method, with Baird-Parker agar and Escherichia coli-coliform chromogenic (ECC) agar. We assessed the population's sociodemographic, behavioral and hygiene characteristics through interviews. Possible presence of S. aureus colonies was confirmed using agglutination tests, with evaluation of methicillin sensitivity. Colonies in ECC medium were counted. Stepwise logistic regression (forward P < 0.15) was performed to identify characteristics associated with bacterial contamination. RESULTS: The prevalence rates of S. aureus, MRSA and Enterobacteriaceae were, respectively, 32%, 4% and 3%. No difference was found between the hospital and university-based populations (P > 0.05). The only variable associated with bacterial contamination was the use of cloth/velvet/leather phone cases (odds ratio: 2.92; 95% confidence interval: 1.08-7.91). CONCLUSIONS: Potentially pathogenic bacteria were prevalent on the cell phones of this hospital and university population. Use of phone cases made of cloth-like material should be discouraged, especially in hospital settings.

Resistência de Neisseria gonorrhoeae a antimicrobianos na prática clínica: como está o Brasil? / Antimicrobials resistance of Neisseria gonorrhoeae in clinical practice: where Brazil stands?

Estima-se que um milhão de infecções sexualmente transmissíveis (IST) sejam adquiridas por dia no mundo, segundo a Organização Mundial da Saúde. Elas podem ser causadas por diversos micro-organismos pelo contato sexual. Embora tratáveis, as infecções, como a clamidiana, sífilis, tricomoníase e gonorreia, são responsáveis por 350 milhões de novos casos de IST anualmente no mundo. A gonorreia é a segunda IST bacteriana mais prevalente no planeta e tem chamado atenção nos últimos anos em decorrência da baixa eficácia em seu tratamento. O agente etiológico é a Neisseria gonorrhoeae. Na maioria das mulheres, a infecção por esse micro-organismo é assintomática, dificultando ainda mais seu diagnóstico e tratamento e, portanto, aumentando o risco de desenvolvimento de suas complicações associadas. Mesmo quando diagnosticada, essa infecção está sujeita a um alto índice de insucesso terapêutico que se deve, principalmente, à grande plasticidade genética da N. gonorrhoeae para aquisição de genes cromossômicos ou plasmidiais de resistência. O aumento da resistência desse micro-organismo a antimicrobianos comumente utilizados no tratamento, como penicilina, tetraciclina e ciprofloxacina, tem sido relatado em diversos países. No Brasil, poucos estudos estão disponíveis, mas em alguns estados já foram relatadas linhagens resistentes à ciprofloxacina. Dessa forma, deve-se ressaltar a importância de novos estudos que visem descrever o perfil da resistência da N. gonorrhoeae a antimicrobianos. Tais achados certamente nortearão a implementação de sistemas de vigilância epidemiológica no país visto que, até o momento, as infecções por N. gonorrhoeae sequer estão incluídas na lista nacional de doenças e agravos de notificação compulsória.(AU)

According to the World Health Organization, approximately one million sexually transmitted infections (STI) are acquired daily in the world. These infections can be caused by several microorganisms via contact. The treatable STI, such as chlamydia, syphilis, trichomoniasis and gonorrhea, account for 350 million new cases of STI each year worldwide. Gonorrhoea is caused by Neisseria gonorrhoeae and is the second most common bacterial STI in the world. It has drawn more attention in the last years due to the low efficacy in its treatment. Most women with this infection are asymptomatic, which makes its diagnosis and treatment troublesome increasing the risk for its associated complications. Even when diagnosed, this infection is subject to a high rate of therapeutic failure mainly due to the great genetic plasticity of N. gonorrhoeae for the acquisition of chromosomal or resistance plasmid enes. Increased resistance of this microorganism to antimicrobials commonly used in treatment such as penicillin, tetracycline and ciprofloxacin has been reported in several countries. In Brazil, few studies are available, but in some states strains resistant to ciprofloxacin were alreadyreported. The refore, it is important to highlight the importance of new studies aimed at describing the resistance profile of N. gonorrhoeae to antimicrobials in Brazil context. These findings will certainly guide the implementation of epidemiological surveillance systems in the country, since until now N. gonorrhoeae infections do not figure into the national list of compulsorily notifiable diseases.(AU)

Bacterial vaginosis in pregnant adolescents: proinflammatory cytokine and bacterial sialidase profile. Cross-sectional study / Vaginose bacteriana em gestantes adolescentes: perfil de citocinas proinflamatórias e sialidases bacterianas. Estudo transversal

ABSTRACT CONTEXT AND OBJECTIVE: Bacterial vaginosis occurs frequently in pregnancy and increases susceptibility to sexually transmitted infections (STI). Considering that adolescents are disproportionally affected by STI, the aim of this study was to evaluate the cervicovaginal levels of interleukin (IL)-1 beta, IL-6, IL-8 and bacterial sialidase in pregnant adolescents with bacterial vaginosis. DESIGN AND SETTING: Cross-sectional study at mother and child referral units in Belém, Pará, Brazil. METHODS: Vaginal samples from 168 pregnant adolescents enrolled were tested for trichomoniasis and candidiasis. Their vaginal microbiota was classified according to the Nugent criteria (1991) as normal, intermediate or bacterial vaginosis. Cervical infection due to Chlamydia trachomatisand Neisseria gonorrhoeae was also assessed. Cytokine and sialidase levels were measured, respectively, using enzyme-linked immunosorbent assays and MUAN conversion in cervicovaginal lavages. Forty-eight adolescents (28.6%) were excluded because they tested positive for some of the infections investigated. The remaining 120 adolescents were grouped according to vaginal flora type: normal (n = 68) or bacterial vaginosis (n = 52). Their cytokine and sialidase levels were compared between the groups using the Mann-Whitney test (P < 0.05). RESULTS: The pregnant adolescents with bacterial vaginosis had higher levels of IL-1 beta, IL-6 and IL-8 (P < 0.05). Sialidase was solely detected in 35 adolescents (67.2%) with bacterial vaginosis. CONCLUSIONS: Not only IL-1 beta and sialidase levels, but also IL-6 and IL-8 levels are higher in pregnant adolescents with bacterial vaginosis, thus indicating that this condition elicits a more pronounced inflammatory response in this population, which potentially increases vulnerability to STI acquisition.

RESUMO CONTEXTO E OBJETIVO: A vaginose bacteriana é uma condição, comum em gestantes, que aumenta a susceptibilidade a infecções sexualmente transmissíveis (IST). Considerando que adolescentes são desproporcionalmente afetadas por IST, o objetivo deste estudo foi avaliar os níveis cervicovaginais de interleucina (IL)-1 beta, IL-6, IL-8 e sialidases bacterianas em gestantes adolescentes com vaginose bacteriana. DESENHO DO ESTUDO E LOCAL: Estudo transversal em Unidade de Referência Materno Infantil (UREMIA), Belém, Pará, Brasil. MÉTODOS: Amostras vaginais das 168 gestantes adolescentes incluídas foram testadas para tricomoníase e candidíase e a microbiota vaginal foi classificada em normal, intermediária e vaginose bacteriana, segundo os critérios de Nugent (1991). Infecções cervicais por Chlamydia trachomatis eNeisseria gonorrhoeae também foram avaliadas. Os níveis de citocinas e sialidades foram quantificados, respectivamente, por método imunoenzimático e pela conversão do MUAN nos lavados cervicovaginais. Foram excluídas 48 (28,6%) adolescentes positivas para alguma das infecções investigadas. As 120 gestantes remanescentes foram agrupadas de acordo com o padrão de flora vaginal em: normal (n = 68) e vaginose bacteriana (n = 52). Níveis de citocinas e sialidases foram comparados pelo teste de Mann-Whitney, P < 0,05. RESULTADOS: As gestantes adolescentes com vaginose bacteriana entre os grupos apresentaram níveis aumentados de IL-1 beta, IL-6 and IL-8 (P < 0,05). Sialidases foram exclusivamente detectadas em 35 (67,2%) adolescentes com vaginose bacteriana. CONCLUSÕES: Não apenas a IL-1 beta e as sialidases estão aumentadas em gestantes adolescentes com vaginose bacteriana, mas também IL-6 e IL-8, indicando resposta inflamatória mais pronunciada dessa alteração de microbiota nesta população, potencializando a vulnerabilidade à aquisição de IST.

Correlation between API 50 CH and multiplex polymerase chain reaction for the identification of vaginal lactobacilli in isolates

Identification of Lactobacillus sp. strains by phenotypic methods may lead to doubtful results possibly interfering in the reliability of the epidemiological and probiotics studies. Therefore this study aimed to determine the best methodology for the identification of the large diversity of lactobacilli species found in the vagina by comparing two techniques, one based on their biochemical profile and other employing molecular biology. A carbohydrate fermentation test (API 50 CH) was compared with multiplex polymerase chain reaction (PCR) for the identification of species of vaginal lactobacilli from 135 healthy women. The kappa index was used to evaluate agreement between the methods. Using the molecular technique, L. crispatus (32.6 percent), L. jensenii (25 percent) and L. gasseri (20.6 percent) were the most frequent species. However, using the biochemical technique, the most frequent species were: L. acidophilus (34.8 percent), L. crispatus (27.2 percent) and L. fermentum (13 percent). Although L. acidophilus was the most frequent specie found by biochemical tests, no strain of this microorganism was detected by PCR. Agreement between the methods was low for identification of all the most common species. Although rates of L. crispatus detected were similar using both methods (32.6 percent and 27.2 percent), agreement between them was relatively low (kappa = 0.52). Conclusions: Our results confirmed the limitation of the biochemical method and the applicability of a previously published molecular method (Multiplex PCR) for the identification of lactobacilli in the vaginal tract, focusing on further necessity of its improvement for also targeting L. vaginalis and L. iners.

Detection of Streptococcus agalactiae colonization in pregnant women by using combined swab cultures: cross-sectional prevalence study / Detecção de colonização por Streptococcus agalactiae em gestantes por meio da cultura de swabs combinados: estudo transversal de prevalência

CONTEXT AND OBJECTIVE: Maternal Streptococcus agalactiae colonization and early-onset neonatal sepsis have aroused interest in the worldwide literature. Streptococcal neonatal disease is associated with significant morbidity and mortality in the perinatal period, especially among premature neonates. The aim of this study was to assess the prevalence of maternal streptococcal colonization by using combined swab cultures, compared with swab collection from a single site. DESIGN AND SETTING: Cross-sectional study at Faculdade de Medicina de Botucatu, Universidade Estadual Paulista. METHODS: Samples were obtained from 405 patients at gestational ages of 35 to 37 weeks. Swabs from the perianal (rectal) region, vaginal introitus and upper lateral vaginal vault were cultured in Todd-Hewitt selective broth. Colonies suggestive of Streptococcus agalactiae were subjected to the catalase and CAMP (Christie, Atkins, Munch-Petersen) tests. To evaluate the positivity of combined swab cultures, Tukey's test was used for comparison of proportions. RESULTS: The prevalence of streptococcal colonization was 25.4 percent. Among the patients with positive cultures, 28.1 percent had this at only one collection site, 24.2 percent simultaneously at two sites and 47.5 percent at all three sites. Associating the swabs from two collection sites significantly increased streptococcal isolation, compared with a single swab (P < 0.05), except for perianal (rectal) collection. Use of combined swabs from three collection sites showed statistically higher isolation rates. CONCLUSION: In combined swab cultures collected from three collection sites, the prevalence of maternal Streptococcus agalactiae colonization was higher than in swabs collected from a single site.

CONTEXTO E OBJETIVO: Colonização materna por Streptococcus agalactiae e sepse neonatal de início precoce têm despertado interesse na literatura mundial. A doença estreptocócica neonatal está associada com significantes índices de morbidade e mortalidade perinatal, principalmente nos recém-nascidos prematuros. O objetivo deste estudo foi avaliar a prevalência de colonização estreptocócica materna por meio da coleta de swabs combinados, comparada com coleta de swab num único local. TIPO DE ESTUDO E LOCAL: Estudo transversal na Faculdade de Medicina de Botucatu, Universidade Estadual Paulista. MÉTODOS: Foram obtidas amostras de 405 pacientes com idade gestacional entre 35 e 37 semanas. Swabs da região perianal retal, introito vaginal e terço distal da parede vaginal foram cultivados em caldo seletivo de Todd-Hewitt. Colônias sugestivas de Streptococcus agalactiae foram submetidas aos testes de catalase e CAMP (Christie, Atkins, Munch-Petersen). Para avaliação da positividade de cultura de swabs combinados foi empregado o teste de Tukey para comparação de proporções. RESULTADOS: A prevalência de colonização estreptocócica foi de 25,4 por cento. Dentre as pacientes com cultura positiva, 28,1 por cento tiveram positividade em apenas um local de coleta, 24,2 por cento em dois locais simultaneamente e 47,5 por cento nos três locais avaliados. Associação de swabs de dois locais de coleta aumentou significativamente o isolamento estreptocócico, comparado a único swab (P < 0,05), exceto para coleta perianal. (retal) Utilização de swabs combinados de três locais de coleta mostrou taxas de isolamento estatisticamente superiores. CONCLUSÃO: Na cultura de swabs combinados de três locais de coleta houve maior prevalência de colonização materna por Streptococcus agalactiae, comparada com coleta de swabs em um único local.

Prevalência e caracterização de espécies de lactobacilos vaginais em mulheres em idade reprodutiva sem vulvovaginites / Prevalence and characterization of vaginal lactobacillus species in women at reproductive age without vulvovaginitis

OBJETIVO: identificar espécies de lactobacilos isolados do conteúdo vaginal de mulheres saudáveis e assintomáticas; determinar as espécies mais prevalentes e caracterizá-las fenotipicamente. MÉTODOS: lactobacilos foram isolados em meio seletivo a partir de amostras de conteúdo vaginal de 135 mulheres, sem queixa de corrimento e com diagnóstico laboratorial negativo para infecções vaginais, acompanhadas em um ambulatório de Planejamento Familiar. Os isolados foram identificados por PCR multiplex e, quando necessário, submetidos ao sequenciamento do gene RNAr 16S. Foram também avaliados quanto à acidificação do meio de cultura, à produção de ácido láctico, de H2O2, bacteriocinas e a capacidade de adesão às células epiteliais. RESULTADOS: oitenta e três cepas de lactobacilos foram isoladas e identificadas, sendo as espécies predominantes L. crispatus (30,1%), L. jensenii (26,5%), L. gasseri (22,9%) e L. vaginalis (8,4%). Apenas 20 destes isolados não produziram H2O2 em quantidades detectáveis. Das 37 linhagens selecionadas para teste de adesão a células epiteliais, 12 apresentaram adesão entre 50 a 69%, 10 apresentaram 70% ou mais, e as restantes pouca ou nenhuma adesão. Nenhum dos isolados produziu bacteriocinas. CONCLUSÕES: as espécies de lactobacilos mais prevalentes em mulheres sem vulvovaginites, isoladas em meio de cultura seletivo e identificadas por métodos moleculares, foram L. crispatus, L. jensenii e L. gasseri. Além de mais frequentes, tais linhagens também apresentaram melhor produção de H2O2 e atingiram menores valores de pH em meio de cultura.

PURPOSE: to identify species of lactobacillus isolated from the vaginal contents of healthy and asymptomatic women, determining the most prevalent species and characterizing them phenotypically. METHODS: lactobacillus have been isolated in selective milieu from samples of the vaginal contents of 135 women without complaints of vaginal secretion, and with negative laboratorial diagnosis of vaginal infection, followed up at an outpatient clinic. After being identified by multiplex PCR, the isolates have been submitted to RNAr 16S gene sequencing, when necessary. They have also been evaluated concerning the production of lactic acid, H2O2, bacteriocins and the ability to adhere to epithelial cells. RESULTS: eight-three lactobacillus strains were isolated and identified, L. crispatus (30.1%), L. jensenii (26.5%), L. gasseri (22.9%) e L. vaginalis (8.4%), being the prevalent species. Only 20 of those isolates did not present H2O2 production, in detectable amounts. From the 37 strains selected for the test of adhesion to the epithelial cells, 12 presented 50 to 69% of adhesion, 10 presented 70% or more, and the remaining, little or no adhesion at all. None of the tested strains produced bacteriocins. CONCLUSIONS: the lactobacillus species more prevalent in women without vulvovaginitis, isolated in selective culture milieu and identified by molecular methods were L. crispatus, L. jensenii and L. gasseri. Besides the fact of being more prevalent, these strains also presented better production of H2O2, and reached lower pH values in the culture milieu.

Utilidade da cultura da ponta de cateter no diagnóstico de infecção neonatal / Usefulness of catheter tip culture in the diagnosis of neonatal infections

OBJETIVO: Determinar o número de unidades formadoras de colônias que melhor correlaciona com a infecção relacionada a cateter em recém-nascidos. MÉTODOS: Este foi um estudo prospectivo de culturas semiquantitativas de pontas de cateteres de recém-nascidos da unidade neonatal da Faculdade de Medicina de Botucatu. Os microrganismos isolados de cateteres e hemoculturas periféricas foram identificados e submetidos ao teste de sensibilidade a drogas. O ponto de corte ótimo foi determinado pela curva receiver operating characteristic (ROC). RESULTADOS: Foram estudados 85 cateteres de 63 recém-nascidos. A espécie Staphylococcus epidermidis foi prevalente (75 por cento) nos cateteres. Dos 11 episódios de infecção diagnosticados, oito (72,7 por cento) foram associados aos estafilococos coagulase-negativa, dos quais seis pertenciam à espécie S. epidermidis. Pela curva ROC, o ponto de corte ótimo para o diagnóstico de infecção relacionada a cateter foi 122 unidades formadoras de colônias. CONCLUSÃO: O ponto de corte 122 unidades formadoras de colônias melhor se correlacionou com o diagnóstico de infecção relacionada a cateter em recém-nascidos.

OBJECTIVE: To determine the number of colony-forming units (CFU) that best correlates with catheter-related infections (CRI) in newborns. METHODS: This was a prospective study of semiquantitative cultures of catheter tips obtained from newborns in the neonatal unit at Faculdade de Medicina de Botucatu, state of São Paulo, Brazil. The microorganisms isolated from catheter and peripheral blood cultures were identified and submitted to a drug susceptibility test. The optimal cutoff point was determined by the receiver operating characteristic (ROC) curve. RESULTS: A total of 85 catheters obtained from 63 newborns were studied. Staphylococcus epidermidis was the predominant species in the catheters (75 percent). Eight of 11 (72.7 percent) CRI episodes were associated with coagulase-negative staphylococci, six of which were of the S. epidermidis type. ROC curve analysis indicated that the optimal cutoff point for the diagnosis of CRI was 122 CFU. CONCLUSION: The cutoff point of 122 CFU correlated best with the diagnosis of CRI in newborns.

Comparison between qualitative and semiquantitative catheter-tip cultures: laboratory diagnosis of catheter-related infection in newborns / Comparação entre culturas qualitativa e semiquantitativa de ponta de cateter: diagnóstico laboratorial de infecção relacionada a cateter em recém-nascidos

This prospective study evaluated semiquantitative and qualitative catheter-culture methods for diagnosis of catheter-related infection (CRI) in newborns. Catheter tips from newborns admitted to the Neonatal Unit of the University Hospital of the Botucatu Medical School, UNESP were included in the study. Catheter cultures were performed with both semiquantitative and qualitative techniques. For CRI diagnosis, microorganisms isolated from catheter cultures and from peripheral blood cultures were identified and submitted to agent susceptibility test. The gold standard was the certain CRI diagnosis when same microorganism (specie and profile of susceptibility to agents) was isolated from both catheter tips and peripheral blood culture. A total of 85 catheters from 63 newborns were included in the study. The semiquantitative culture method, despite presenting lower sensitivity (90 percent), showed higher specificity (71 percent) when compared to 100 percent of sensitivity and 60 percent of specificity in the qualitative method. The identification of the microorganisms obtained from the catheter cultures showed a prevalence of coagulase-negative staphylococci(CNS) species. The specie Staphylococcus epidermidis (77.5 percent) was the prevalent in the catheters with positive semiquantitative cultures. Among 11 episodes with CRI diagnosis, 8 (72.7 percent) were associated with CNS species, of which 6 were S. epidermidis. Two episodes of CRI by S. aureus and one by Candida parapsilosis were also detected. The semiquantitative catheter-culture method showed advantages for CRI diagnosis in newborns when compared to the conservative qualitative method.

Este estudo prospectivo avaliou os métodos semiquantitativo e qualitativo de cultura de cateter para o diagnóstico de infecção relacionada a cateter (IRC) em recém-nascidos (RN). Foram incluídas pontas de cateteres provenientes de recém-nascidos internados na Unidade Neonatal do Hospital das Clínicas da Faculdade de Medicina de Botucatu, UNESP. Foram utilizadas as técnicas semiquantitativa e qualitativa de cultura de cateter. Para o diagnóstico de IRC, os microrganismos isolados das culturas de cateteres e de hemoculturas periféricas foram identificados e submetidos ao teste de sensibilidade a antimicrobianos. O padrão ouro correspondeu ao diagnóstico de certeza de IRC, com o isolamento do mesmo microrganismo (espécie e perfil de sensibilidade a antimicrobianos) isolado em hemocultura periférica. Foram estudados 85 cateteres provenientes de 63 RN. A cultura semiquantitativa, embora tenha apresentado menor sensibilidade (90 por cento), apresentou uma maior especificidade (71 por cento) em comparação à sensibilidade de 100 por cento e especificidade de 60 por cento encontradas na cultura qualitativa. Através da identificação dos microrganismos obtidos nas culturas de cateteres, observou-se uma predominância de espécies de Estafilococos coagulase-negativa (ECN). A espécie Staphylococcus epidermidis foi a prevalente (77,5 por cento) nos cateteres com culturas semiquantitativas positivas. Dos 11 episódios de IRC diagnosticados, 8 (72,7 por cento) foram associados a espécies de ECN, dos quais 6 eram da espécie S. epidermidis. Também foram detectados dois casos de IRC por S. aureus e um caso por Candida parapsilosis. O método de cultura semiquantitativo cateter apresentou vantagens para o diagnóstico de IRC em RN quando comparado com o método qualitativo tradicional.