In Vitro and In Vivo Evaluations of Oxacillin Efficiency against mecA -Positive Oxacillin-Susceptible Staphylococcus aureus

Author:

Ikonomidis Alexandros1,Michail George1,Vasdeki Afroditi1,Labrou Maria1,Karavasilis Vasilis1,Stathopoulos Constantinos2,Maniatis Antonios N.1,Pournaras Spyros1

Affiliation:

1. Department of Microbiology, School of Medicine

2. Department of Biochemistry and Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece

Abstract

ABSTRACT Community-type Staphylococcus aureus strains that are positive for mecA and PBP2a but appear phenotypically susceptible to oxacillin are increasingly reported worldwide. Four S. aureus clinical isolates carrying the mecA gene with oxacillin MICs of <2 μg/ml were tested for oxacillin efficiency by population analyses and experimental thigh infections. These isolates harbored staphylococcal cassette chromosome mec type IV and belonged to two genotypes. Two of the four isolates were found by population analysis to be truly oxacillin susceptible. All four isolates exhibited significant reductions in the numbers of colonies grown after dicloxacillin treatment of experimental thigh infections, as also did a mecA -negative S. aureus control strain. These observations indicate that some of the phenotypically oxacillin susceptible mecA -positive Staphylococcus aureus isolates may be at least partially responsive to oxacillin.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

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