Publications by authors named "Ramon A de Torres"

The objectives of this study were to conduct a prevalence survey of trichomoniasis in pregnant women and to evaluate the utility of different methods for its diagnosis. A total of 597 vaginal exudates from pregnant women who were examined at the Hospital de Clinicas in Buenos Aires, Argentina from 1 August 2005 to 31 January 2007, were prospectively and consecutively evaluated. The investigation of Trichomonas vaginalis was made by different microscopic examinations, and culture on liquid medium.

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The replication of herpes simplex virus (HSV) type 1 and 2 in Vero cells is inhibited in the presence of enterocin CRL35 (ECRL), a bacteriocin produced by Enterococcus faecium CRL35. Attempts to resolve the mode of action of ECRL indicate that virus adsorption and penetration are not affected. Instead, a late step of virus multiplication is hindered since the addition of 100 microg/ml of ECRL at 8h post infection still causes a 90% inhibition of virus release.

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The expression of many virulence factors of Bordetella bronchiseptica is regulated by the bvgAS locus and reduced in response to environmental signals called modulators. Virulent strains can alternate between virulent (Bvg(+)), intermediate (Bvg(i)), and modulated (Bvg(+)mod) phenotypes. Potential vaccine antigens can be expressed by Bvg1 strains grown only in the absence of modulators.

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