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Infections caused by Actinomyces viscosus

R H Eng, M L Corrado, D Cleri

    American Journal of Clinical Pathology
    |January 1, 1981
    PubMed
    Summary

    Actinomyces viscosus lung infections are rare in non-immunosuppressed individuals but treatable with penicillin. Diagnosis requires careful specimen collection to identify the organism, distinguishing it from other Actinomyces species.

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    Area of Science:

    • Medical Microbiology
    • Pulmonology

    Background:

    • Actinomyces viscosus is a common oral colonizer but rarely causes lung infections.
    • Previous reports of Actinomyces viscosus lung infections are limited, with only ten cases described.

    Observation:

    • Two cases of Actinomyces viscosus lung infection occurred in non-immunosuppressed patients.
    • One patient presented with a peripheral lung mass mimicking a tumor.
    • Both patients received prolonged penicillin therapy.

    Findings:

    • Actinomyces viscosus lung infections are rare and difficult to distinguish from other Actinomyces species based on clinical presentation alone.
    • Diagnosis relies on identifying the organism in uncontaminated clinical specimens.
    • Successful treatment requires at least three weeks of appropriate antibiotic therapy.

    Implications:

    • Increased awareness of Actinomyces viscosus as a potential pulmonary pathogen in non-immunosuppressed individuals is warranted.
    • Diagnostic laboratories should be aware of the challenges in isolating and identifying Actinomyces viscosus.
    • Long-term antibiotic treatment, guided by in vitro sensitivity, is crucial for successful outcomes in Actinomyces viscosus lung infections.

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