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Septicemia caused by Agrobacterium sp.

J Freney, L D Gruer, N Bornstein

    Journal of Clinical Microbiology
    |October 1, 1985
    PubMed
    Summary

    Agrobacterium radiobacter biovar 2 caused septicemia in an elderly patient on ventilation. Treatment with cefotaxime resolved the infection, indicating a potential link between this bacterium and human illness.

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    Area of Science:

    • Medical Microbiology
    • Clinical Infectious Diseases

    Background:

    • Agrobacterium species are typically plant pathogens.
    • Human infections with Agrobacterium are rare, with limited documented cases.

    Observation:

    • Agrobacterium radiobacter biovar 2 was isolated from the bloodstream of an elderly patient undergoing mechanical ventilation and broad-spectrum antibiotic therapy.
    • The patient's blood cultures repeatedly yielded the organism.
    • No definitive source for the infection was identified within the patient's environment.

    Findings:

    • Septicemia resolved following administration of the antibiotic cefotaxime.
    • The patient demonstrated a significant serological response, with a fourfold increase in antibody titers against Agrobacterium radiobacter biovar 2.
    • Antibody titers were higher than in most healthy individuals, suggesting a genuine immune response.

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  • The isolated organism lacked the plasmid typically associated with plant oncogenicity, differentiating it from common plant-pathogenic strains.

    • Implications:

    • This case adds to the limited evidence linking Agrobacterium species to human infections.
    • It highlights the potential for opportunistic infections by plant-associated bacteria in immunocompromised or critically ill patients.
    • Further research is needed to understand the pathogenesis and clinical significance of Agrobacterium sp. in human disease.