Researchers evaluated medical records from 371 cats with confirmed Microsporum canis (MC) infection. The first negative fungal culture was indicative of MC in 335 (90.3%) cats. In this group, all cats were otherwise healthy and either had obvious lesions (n = 237) or no lesions or evidence of resolving lesions (n = 98).
In the 36 cats with an initial negative culture, one group consisted of healthy but lesional cats (n = 19) that had one negative fungal culture followed within the first 3 weeks of treatment followed by one or more positive fungal cultures.
In the second clinical group, cats were lesional but had concurrent medical problems (n = 17). These cats showed an initial good response to treatment (lesion resolution and an initial negative FC). However, this negative FC was followed by at least one strongly positive FC (>10 colony-forming units/plate) before proceeding to cure. These cats took the longest time to cure (mean 11 weeks; range 8-28 weeks).
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