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Antimicrobial sensitivity was evaluated from 120 strains of coagulase-negative Staphylococcus (CoNS), isolated from urinary infections. The isolated species were identified by conventional methods and sensitivity to vancomycin, tetracyclin, norfloxacin, cephalothin erythromycin, clindamycin, oxacillin, penicillin, cyprofloxacin, ampicillin and ampicillin/sulbactam was tested by the agar dilution technique and the diffusion in disc technique. The distribution of the species was: Staphylococcus epidermidis 26 (21.6%), S. haemolyticus 48 (40.0%), S. saprophyticus 40 (33.4%) and S. simulans 6 (5%). CoNS strains extracted from urinary infections showed a high percentage of vancomycin and tetracyclin sensitivity, and a low sensitivity to beta-lactamic antibiotics, except ampicillin/sulbactam and cephalotin. Isolation percentage resistance to oxacillin was less than 48%. Strains resistant to oxacillin were considered as resistant to both penicillin and ampicillin. From 42% to 80% of S. haemolyticus, S. saprophyticus, Staphylococcus epidermidis and S. simulans were positive to the adherence test. Results from this work showed that slime producing CoNS strains, isolated in Río Cuarto Hospital, had different percentages of resistance to the studied antimicrobial agents.

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Sexually transmitted diseases (STD) are a group of transmittable diseases acquired fundamentally through sexual contact. STD are a social problem resulting from demographic explosion and changes in sexual conduct, which affects teenagers and adults of all socioeconomic strata. The goal of this work was to establish the actual state of the different STD within the studied population. Samples of vaginal fluids, endocervical materials and urethral exudates taken from 2,630 patients during five years were processed. 1,341 samples tested positive to one or more of the microorganisms, 1,099 corresponding to female patients and 242 to male patients. The microorganisms found in women were: Gardnerella vaginalis (39.1%), Candida albicans (21.3%), Trichomonas vaginalis (16.8%), Chlamydia trachomatis (11.5%); Neisseria gonorrhoeae (3.4%), Mycoplasma hominis (2.6%); Ureaplasma urealyticum (4.1%) and Treponema pallidum (1.6%). Associations were: Gardnerella vaginalis with Trichomonas vaginalis (6%), Gardnerella vaginalis with Candida albicans (5.1%); Trichomonas vaginalis with Neisseria gonorrhoeae (2.2%) and Gardnerella vaginalis with Chlamydia trachomatis (2.1%). In men, gonococcic urethritis represented 37.8%, non-gonococcic urethritis 55.4% and Treponema pallidum 6.8%. A decrease in syphilis, gonococcic urethritis and gonococcic cervicitis was observed, increasing the prevalence of non-gonococcic urethritis and cervicitis. This study showed that in our environment the actual tendency of STD is still high.

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Chalamydia trachomatis, Ureaplasma urealyticum y Mycoplasma hominis son microorganismos responsables de infecciones urogenitales. Son aislados con considerable frecuencia del tracto genital femenino. En este trabajo se estudiaron 100 exudados vaginales de mujeres promiscuas que concurrieron a la división de Bacteriología del Hospital Central de Río Cuarto. En todas las muestras se investigó la presencia de C. trachomatis, U. urealyticum, M. hominis. La prevalencia hallada fue: C. trachomatis 17 por ciento; U. urealyticum 57 por ciento; M. hominis 21 por ciento y Neisseria gonorrhoeae 2 por ciento. Las asociaciones más frecuentes fueron: C. trachomatis-Trichomonas vaginalis, micoplasmas-T. vaginalis y Gardnerella vaginalis-Candida albicans con un 18 por ciento, 15 por ciento y 8 por ciento respectivamente

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Chalamydia trachomatis, Ureaplasma urealyticum y Mycoplasma hominis son microorganismos responsables de infecciones urogenitales. Son aislados con considerable frecuencia del tracto genital femenino. En este trabajo se estudiaron 100 exudados vaginales de mujeres promiscuas que concurrieron a la división de Bacteriología del Hospital Central de Río Cuarto. En todas las muestras se investigó la presencia de C. trachomatis, U. urealyticum, M. hominis. La prevalencia hallada fue: C. trachomatis 17 por ciento; U. urealyticum 57 por ciento; M. hominis 21 por ciento y Neisseria gonorrhoeae 2 por ciento. Las asociaciones más frecuentes fueron: C. trachomatis-Trichomonas vaginalis, micoplasmas-T. vaginalis y Gardnerella vaginalis-Candida albicans con un 18 por ciento, 15 por ciento y 8 por ciento respectivamente (AU)

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METHODS: A simple and reproducible proposed for Benito et al. scheme for identification biotypes of Gardnerella vaginalis has been developed, based on reactions for lipase, hippurate, hydrolysis, and beta-galactosidase. RESULTS: 11 biotypes were found among 130 strains from women with and without bacterial vaginosis (non-specific vaginitis) 1A, 5B; 8B, 5C, 8C, 1E, 6G and 7G in women with vaginosis and the biotypes 1A, 5B, 8B, 1C, 8F and 6H in women without vaginosis. These biotypes 1A; 5B and 8B were found in two groups. CONCLUSIONS: These data suggest that some biotypes of G. vaginalis are associated with bacterial vaginosis.

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Sexually transmitted diseases (STD) are acquired mainly through sexual intercourse, being one of the most frequent groups of infectious diseases worldwide and consequently an important public health problem. The aim of this paper was to determine the current state of STD and to compare different diagnostic methods in the population studied. A total of 1060 samples from vaginal flows, endocervical material and urethral discharge were studied during 3 years. Of the total samples, 583 were positive, 493 in women and 90 in men. Microorganisms found in women were: Gardnerella vaginalis (39.3%), Candida albicans (21.1%), Trichomonas vaginalis (17.3%), Candida trachomatis (11.3%), Neisseria gonorrhoeae (3.2%): Mycoplasma hominis and Ureaplasma urelyticum (6.5%) and Treponema pallidum (1.4%), the associations found were, Gardnerella vaginalis with Trichomonas vaginalis 5.5%; Gardnerella vaginalis with Candida albicans 4.9%; Trichomonas vaginalis with Neisseria gonorrhoeae (2.2%) and Gardnerella vaginalis with Chlamydia trachomatis (1.9%). In men, gonococcal urethritis (UG) represented 37.7% non UG 55.6% and Treponema pallidum 6.7%. These results indicate a decrease in sifilis and in UG when compared to previous studies showing that gonococcal cervicitis had also decreased. We found an important increase in the prevalence of urethritis and non gonococcal cervicitis in agreement with world statistics which consider these diseases as the most common venereal ones. It is necessary to increase the search for Chlamydia trachomatis in pregnant women due to vertical transmission. It should be noted that, in spite of certain fluctuations, the incidence of the STD in our area is still unacceptably high.

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El objetivo de este trabajo fue evaluar la prevalencia de las infecciones producidas por Chlamydia trochomatis en pacientes que concurrieron al servicio de Ginecología. Se estudiaron 369 pacientes mujeres, sexualmente activas que consultaron por presencia de flujo y/o síntomas de cervicitis. Para la detección de antígenos clamidiales se usó un enzimoinmunoensayo con anticuerpos monoclonales específicos (Chlamyfast). La prevalencia de las infecciones por C. trachomatis en la población estudiada fue del 15,17 por ciento (56/369). El 71,4 por ciento (40/56) de las mujeres fueron sintomáticas y el 28,6 por ciento (16/56), asintomáticas (P < 0,00001). La mayor incidencia se observó en el grupo de mujeres cuyas edades oscilaron entre 21 y 30 años (21/149)

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El objetivo de este trabajo fue evaluar la prevalencia de las infecciones producidas por Chlamydia trochomatis en pacientes que concurrieron al servicio de Ginecología. Se estudiaron 369 pacientes mujeres, sexualmente activas que consultaron por presencia de flujo y/o síntomas de cervicitis. Para la detección de antígenos clamidiales se usó un enzimoinmunoensayo con anticuerpos monoclonales específicos (Chlamyfast). La prevalencia de las infecciones por C. trachomatis en la población estudiada fue del 15,17 por ciento (56/369). El 71,4 por ciento (40/56) de las mujeres fueron sintomáticas y el 28,6 por ciento (16/56), asintomáticas (P < 0,00001). La mayor incidencia se observó en el grupo de mujeres cuyas edades oscilaron entre 21 y 30 años (21/149) (AU)

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BACKGROUND: Pseudomonas aeruginosa with inhibitory capacity in vitro was studied on Gardnerella vaginalis strains. METHODS: Antimicrobial activity was demonstrated by inhibitory halos of bacterial growth on solid media by two methods: crossed streak and agar well diffusion. The inhibitory activity of this substance produced by P. aeruginosa was characterized as bacteriocin by: activity spectrum sensitivity proteolytic enzyme, chloroform, heat, pH, ultraviolet, irradiation effect and molecular weight. RESULTS: Four strains of P. aeruginosa producers of bacteriocins were chosen for this study and contacted with 40 strains of G. vaginalis. The producing strain D inhibited 70% of these G. vaginalis strains. The strains B and C inhibited 55% and 52.5%, respectively. The 3 strains presented a wide rank of action but the strain A had effect on a few strains of G. vaginalis. CONCLUSIONS: This work showed the inhibitory in vitro effect of bacteriocins of P. aeruginosa on strains of G. vaginalis. The results obtained suggest the probable topic application of bacteriocins as an alternative of conventional therapeutic on this infection biological control.

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One hundred and seventy nine women of discharge vaginal were studied. Endocervical and exocervical samples were obtained. The vaginal fluids samples were processed by the following tests: pH, fishy odor, clue cells observation was done by Gram reaction. Gardnerella vaginalis was identified through biochemical tests. G. vaginalis (23.4%), C. albicans (21.8%), T. vaginalis (14.5%), N. gonorrhoeae (5.5%) and C. trachomatis (11.7%), were found in 42 women. A 7.1% of forms compatible with Mobiluncus spp. were observed by direct Gram. The relation between isolation of G. vaginalis and the presence of clue cells was 95.2%. There was a sensitivity of 95.2%, 100% specificity and a predictive positive value of 100%.

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Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium, this pigment was purified by solvent extraction and ion exchange, then sterilized by filtration. Where cytotoxic effect on human leukocytes was assayed, death and lysis was observed. Sublytic doses decreased leukocytes phagocytosis and chemotaxis. Bacteria grew and produced pigment in blood stored a 4 degrees C, with a pyoverdine production of 0.13 mg/ml of serum after 5 days of incubation.

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Antibacterial substances were found in Pseudomonas, they were heat and trypsin resistant, molecular weight less than 10,000 daltons, produced in minimal media, optimum pH 7.0. Methionine and glycine inhibited them; other amino acids produced less antagonistic effect. An inverted relationship between susceptibility to microcin and Fe3+ concentration was observed in experiments with iron-depleted strains. Pseudomonas was sensitive to its own microcin in iron-free medium; this is an important finding in the study of the immunity of microcin-producing strains.

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Pseudomonas fluorescens grows and produces pigment in refrigerated human blood at 4 degrees C. Saline precipitation of plasma showed that globulin and albumin fractions retained pyoverdin at different concentrations. By dialysis it was possible to determine that the pigment attached or aggregated to the protein in total plasma as well as in the fraction obtained by saline precipitation. A greater binding was observed at the globulin fraction. Gamma-globulin immunological activity was reduced due to the interaction with pyoverdin, as much in agglutination reaction (VDRL) as in neutralization (Streptolysin O).

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Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium. Pigment was purified by solvent extraction and ion exchange, and sterilized and used as siderophore for E. coli, P. fluorescens, ATCC 13.525, ATCC 17.400, W and PAB strains. Bacteria were grown in iron-free medium and medium with iron. Free--pyoverdine and pyoverdine bound to Fe+3 were added in different concentrations. P. fluorescens PAB siderophore did not stimulate E. coli growth while it was selective for other P. fluorescens strains. Paper disks impregnated with pyoverdine did not inhibit E. coli growth.

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Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium. Pigment was purified by solvent extraction and ion exchange, and sterilized and used as siderophore for E. coli, P. fluorescens, ATCC 13.525, ATCC 17.400, W and PAB strains. Bacteria were grown in iron-free medium and medium with iron. Free--pyoverdine and pyoverdine bound to Fe+3 were added in different concentrations. P. fluorescens PAB siderophore did not stimulate E. coli growth while it was selective for other P. fluorescens strains. Paper disks impregnated with pyoverdine did not inhibit E. coli growth.

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Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium. Pigment was purified by solvent extraction and ion exchange, and sterilized and used as siderophore for E. coli, P. fluorescens, ATCC 13.525, ATCC 17.400, W and PAB strains. Bacteria were grown in iron-free medium and medium with iron. Free--pyoverdine and pyoverdine bound to Fe+3 were added in different concentrations. P. fluorescens PAB siderophore did not stimulate E. coli growth while it was selective for other P. fluorescens strains. Paper disks impregnated with pyoverdine did not inhibit E. coli growth.

RESUMEN

Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium. Pigment was purified by solvent extraction and ion exchange, and sterilized and used as siderophore for E. coli, P. fluorescens, ATCC 13.525, ATCC 17.400, W and PAB strains. Bacteria were grown in iron-free medium and medium with iron. Free--pyoverdine and pyoverdine bound to Fe+3 were added in different concentrations. P. fluorescens PAB siderophore did not stimulate E. coli growth while it was selective for other P. fluorescens strains. Paper disks impregnated with pyoverdine did not inhibit E. coli growth.

RESUMEN

Pseudomonas fluorescens PAB strain produced pyoverdine in a synthetic medium. Pigment was purified by solvent extraction and ion exchange, and sterilized and used as siderophore for E. coli, P. fluorescens, ATCC 13.525, ATCC 17.400, W and PAB strains. Bacteria were grown in iron-free medium and medium with iron. Free--pyoverdine and pyoverdine bound to Fe+3 were added in different concentrations. P. fluorescens PAB siderophore did not stimulate E. coli growth while it was selective for other P. fluorescens strains. Paper disks impregnated with pyoverdine did not inhibit E. coli growth.

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Pyoverdin was purified from Pseudomonas fluorescens cultured in a synthetic medium. Cytotoxic effect on human leukocytes was assayed. Death and lysis was observed depending on concentration and time. Sub-lytic dose decreased leukocyte phagocytosis. The pigment was produced by P. fluorescens in blood stored at 4 degrees C. Saline precipitation of plasma showed that globulin and albumin fraction retained 46% and 37% of pyoverdin, respectively. By means of dialysis it was possible to determine that albumin retained more pigment than the other fractions either bound to the protein or aggregated.

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Se purificó pioverdina de pseudomonas fluorescens desrrollada en medio sintético y se practicó un ensayo de toxicidad pra leucocitos totales humanos (LTH); se observó un alto índice de muerte y lisis celular, dependiendo de la concentración y tiempo de incubación. Dosis sublíticas redujeron la capacidad fagocítica de los LTH. Hubo síntesis del pigmento en sangre inoculada con cepas de P. fluorescens a 4-C. la precipitación salina del plasma indicó que las fracciones ricas en globulina y albúmina retuvieron pioverdina en distintos porcentajes (46% y 37% respectivamente). Mediante diálisis se observó que la fracción con albúmina mantenía mayor cantidad del pigmento unido e en estado de agregación

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