[Phagotherapy faced with Staphylococcus aureus methicilin resistant infections in mice].

Objectives: To assess the bacteriophage activity in localized and systemic infections caused by Staphylococcus aureus resistant to methicilin (MRSA).

Materials And Methods: An experimental study was performed in 45 mice of the Balb/c strain divided in nine groups of five individuals. Ten naive bacteriophages were isolated through clinical samples and hospital effluents.

[Comparison of four phenotypic methods to detect extended-spectrum betalactamases].

Objective: To compare the efficacy of four phenotypic methods for the identification of strains producing extended-spectrum β-lactamases isolated from urine cultures.

Materials And Methods: Comparative cross-sectional study. 147 strains isolated from positive urine cultures for Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis between January and February 2009 in the National Institute of Health of Children underwent a screening test, those which resulted positive were processed for confirmatory testing through the four phenotypic methods evaluated.