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Antimicrobial resistance of Staphylococcus aureus and oral streptococci strains from high-risk endocarditis patients

Lookup NU author(s): Juliana Ramacciato, Dr John Meechan


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This study sought to determine the antimicrobial susceptibility of Staphylcoccus aureus and viridans group streptococci strains collected from the forearm skin and saliva of 30 patients at high risk of endocarditis. Agar susceptibility tests of antibiotics routinely utilized in dentistry were used to verify antimicrobial resistance of bacterial strains. Of the Staphylcoccus aureus strains, 50% were resistant to ampicillin, 53.3% to amoxicillin, 60.0% to penicillin G, 13.3% to amoxicillin/clavulanate, 20.0% to azithromycin, 27.6% to clarithromycin, 23.3% to erythromycin, 3.3% to cefazolin, and 6.7% to clindamycin. Regarding streptococci, 16.7% of the strains were resistant to ampicillin, 16.7% to amoxicillin, 23.3% to azithromycin, 23.3% to clarithromycin, 30.0% to erythromycin, 13.3% to cefazolin, 26.7% to clindamycin, 16.7% to penicillin G, and 3.3% to amoxicillin/clavulanate. Pathogens associated with bacterial endocarditis exhibited elevated resistance rates against the antibiotics used for prophylaxis in dentistry.

Publication metadata

Author(s): Groppo FC, Castro FM, Pacheco ABND, Motta RHL, De Mattos Filho TR, Ramacciato JC, Florio FM, Meechan JG

Publication type: Article

Publication status: Published

Journal: General Dentistry

Year: 2005

Volume: 53

Issue: 6

Pages: 410-413

Print publication date: 01/11/2005

ISSN (print): 0363-6771

ISSN (electronic):

Publisher: National Center for Biotechnology Information


PubMed id: 16366048