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Infect Immun. 1973 November; 8(5): 743-751
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Pathogenicity of Allescheria boydii for Mice

Department of Microbiology, University of Iowa, Iowa City, Iowa 52242

ABSTRACT

Allescheria boydii and its imperfect state, Monosporium apiospermum, were studied to determine whether asexual or sexual strains might exhibit different pathogenic potentials for mice. Six different strains of the fungus were inoculated into mice by the intravenous, intracerebral, intraperitoneal, and intranasal routes. Cortisone-treated mice regularly developed infections after inoculation by any of the routes tested. Mice that had not been treated with cortisone were most susceptible to infection by the intravenous route and least susceptible to infection by the intranasal or intraperitoneal route; nevertheless, all animals that did not receive cortisone were considerably more resistant to infection by the fungus than were comparable groups of cortisone-treated animals. Pathogenicity of the fungus appears to be strain dependent and entirely unrelated to its sexual or asexual form. Studies made to determine accurate viable spore counts of the fungus revealed that the highest viable spore count was generally observed using Sabouraud dextrose agar or potato dextrose agar at an incubation temperature of 37 C for a period of 5 days.

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