|Cardiobacterium hominis on blood agar plate|
Cardiobacterium hominis is a Gram-negative rod commonly grouped with other bacteria into the HACEK group. It is one of several bacteria normally present in the mouth and upper part of the respiratory tract such as nose and throat. However, it may also rarely cause endocarditis, an infection of the heart valves.
C. hominis is a catalase-negative, oxidase-positive, indole-producing Gram-negative rod. Its morphology has classically been described as highly pleomorphic and irregularly staining, although homogeneous bacilli with uniform shapes may be seen with the addition of yeast extract.
Historically C. hominis has been sensitive to trimethoprim-sulfamethoxazole, fluoroquinolones, and aztreonam. C. hominis is often resistant to erythromycin. Since cefotaxime use may be not appropriate for C. hominis endocarditis, an alternative regimen might include association of co-amoxiclav and gentamicin.
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- Cardibacterium homininsImage: