1984 Volume 37 Issue 9 Pages 568-571
M.gypseumand M.caniswere inoculated into soil and left for a given period of time under a similar condition to the outdoor circumstance or by the window. As a result, M.gypseumwas recovered by culture after exposure to daylight at room temperature by the window for 15 days, but M. canis in soil showed no growth in culture by the hair-baiting technique after exposure to daylight for 7 or 10 days or over. When M.gypseumand M.caniswere inoculated together into soil and cultured immediately, the surface of the soil was coverd with colonies of M.gypseumgrowing rapidly on the 15th day ofculture, but no growth of M.caniswas observed on the same day.
These results support the conventional views that M.canishas rarely been isolated from soil, and that soil has failed to serve as the source of M.canisinfection.