Reproducible Method for Induction of Pulmonary Coccidioidomycosis in Mice

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Abstract
Intranasal instillation of an inoculum has been suggested as a method for establishment of experimental pulmonary infections. Because we encountered untoward variation in rates and times of death with use of this method for inducing coccidioidomycosis in mice, a simple method for direct intratracheal infection was devised. With doses of 50 or 100 arthrospores of Coccidioides immitis, mortality rates were 80%–90% from 14 to 25 days after infection by the intratracheal route and 20%–60% from 12 to 24 days after infection by the intranasal route. The procedure for intratracheal infection caused only slight morbidity, and the method resulted in consistent rates of disease.

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