Abstract
Samples of 109 breast masses were cultured aerobically and anaerobically forMobiluncus spp. using selective and non-selective media. Two of the 103 evaluable samples were sterile and 57 (55%) yielded facultative bacteria only. The remaining 44 (43%) contained anaerobic growth alone or mixed infections. Seven (16%) of the 44 samples with anaerobes, six from women and one from a man, yieldedMobiluncus spp. Six were identified asMobiluncus curtisii and one asMobiluncus mulieris. There were two types of breast abscesses: one withStaphylococcus aureus predominating and one with anaerobes predominating. Most of the anaerobes belonged to the normal vaginal flora, but some were members of the normal oral flora. These results support the hypothesis that breast infections with these anaerobes result from sexual activities.

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