[Research regarding extended-spectrum beta-lactamases produced by enterobacteria strains].

Aim: To evaluate the susceptiblity of extended spectrum beta-lactamase (ESBL) producing organisms among Escherichia coli and Klebsiella pneumoniae, isolated between January-October 2009 from hospital and community.

Materials And Methods: From 611 enterobacteria strains, for 112 strains (E. coli, n = 84 and K.

[Persistent and recurrent skin infection with small-colony variant methicillin-resistant Staphylococcus aureus].

S. aureus is one of the problematic bacteria, capable to develop resistance mechanisms to all antibiotics that the bacteria are naturally susceptible. A particular phenotypic mechanism, especially against the antibiotics that repressed the synthesis of the cellular wall and aminoglycosides, was evidenced in subpopulations that grows in small-colonies and represents auxotrophic mutants for hemin, menadione or thymidine.

[Screening methods for detection of metallo-beta-lactamase producing gram negative rods].

Modified Hodge test and a method using a disk with imipenem plus 1000 mg of EDTA were used to determine the presence of metallo-beta-lactamase producing gram-negative rods among 166 clinical isolates from hospitals in Iaşi and Galaţi. Of 9 imipenem resistant strains found, only one Pseudomonas aeruginosa gave positive results with both tests and other two P. aeruginosa clinical isolates gave negative results with both tests.