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  • Title: [Gardnerella vaginalis: transport, microscopy, testing resistance].
    Author: Altrichter T, Heizmann WR.
    Journal: Geburtshilfe Frauenheilkd; 1994 Nov; 54(11):606-11. PubMed ID: 8719002.
    Abstract:
    UNLABELLED: G. vaginalis is an important pathogen in the aetiology of bacterial vaginosis. Therefore, we investigated the influence of transport systems in isolation, a scoring system for Gram stains, and susceptibility to antimicrobial agents. The comparison between a simple (Transwab) and a sophisticated (Port-A-Cul) system showed no differences with regard to for instance Enterococcus faecalis or Escherichia coli; however, isolation of G. vaginalis, a fastidious microorganism, was significantly higher (alpha < 0.0001) in Port-A-Cul. There was a strong correlation (97.5%) using the scoring system indicating bacterial vaginosis and isolation of G. vaginalis. The minimal inhibitory concentrations (MIC) of metronidazole for 60 strains of G. vaginalis were higher than 32 mg/l, some strains showing heteroresistance. This phenomenon may be an explanation for treatment failures. Clindamycin and erythromycin were much more active, with MIC's between 0.016 and 0.19 mg/l, in-vitro development of resistance being slower for clindamycin than for erythromycin. CONCLUSIONS: (I) for isolation of G. vaginalis, a sophisticated transport system is mandatory; (II) a scoring system for Gram staining is helpful in diagnosis of bacterial vaginosis; (III) in patients with metronidazole treatment failures, clindamycin should be used.
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