Comparative Pathogenicity of Actinomyces naeslundii and Actinomyces israelii

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Abstract
Typical actinomycosis has been produced in mice following single intraperitoneal injections of saline suspensions of Actinomyces israelii and A. naeslundii. A. israelii produced infections in 95.8% of the animals inoculated. A. naeslundii, generally considered to be a saprophytic organism, produced lesions in 89.7% of the inoculated animals. The finding that A. naeslundii produced lesions in mice similar to those produced by A. israelii suggests that A. naeslundii has similar pathogenic potential for man. The isolation of A. naeslundii from suppurative lesions of man also supports this conclusion.

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