In vitro antimicrobial susceptibility of Aerococcus urinae to 14 antibiotics, and time-kill curves for pencillin, gentamicin and vancomycin

Robert Skov, Jens Joørgen Christensen, Bent Korner, Niels Frimodt-Moøller, Frank Espersen

    Publikation: Bidrag til tidsskriftArtikelForskningpeer review

    Abstrakt

    Aerococcus urinae is a newcomer in clinical and microbiological practice, causing urinary tract infections, bacteraemia/septicaemia and/or endocarditis. This study presents for the first time an evaluation of the activity of a representative panel of antibiotics against a large number of A. urinae isolates. The in vitro susceptibilities (MICs) of 56 isolates of A. urinae to 14 antibiotics were determined by agar dilution. In general, A. urinae isolates showed little inter-isolate variability, and had low MICs of penicillin, amoxicillin, piperacillin, cefepime, vancomycin and rifampicin. High-level aminoglycoside resistance was not found for any of the isolates. Moderate to good activity was seen with quinolones, erythromycin and tetracycline. Isolates from two patients with endocarditis were studied with time-kill curves for penicillin, gentamicin and vancomycin. Penicillin and vancomycin alone exhibited slow or no bactericidal activity against the two strains. When combining either penicillin or vancomycin with gentamicin, rapid bactericidal activity was obtained for both strains with both combinations. The treatment options for A. urinae seem to include penicillins for less severe cases. In severe cases, i.e. endocarditis, the time-kill investigations suggest a beneficial effect of combination with gentamicin. In the penicillin-allergic patient vancomycin in combination with gentamicin represents the most obvious alternative.

    OriginalsprogEngelsk
    Sider (fra-til)653-658
    Antal sider6
    TidsskriftJournal of Antimicrobial Chemotherapy
    Vol/bind48
    Udgave nummer5
    StatusUdgivet - 11 dec. 2001

    Fingeraftryk Udforsk hvilke forskningsemner 'In vitro antimicrobial susceptibility of Aerococcus urinae to 14 antibiotics, and time-kill curves for pencillin, gentamicin and vancomycin' indeholder.

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