Ringworm in guinea pigs due to Trichophyton mentagrophytes

Abstract

Ringworm infection due to Trichophyton mentagrophytes var. granulosum was recorded in a laboratory colony of guinea pigs. The organism was isolated from 11 samples of hair and skin scrapings but only three were positive on direct microscopic examination.
The source of infection is not known. Lesions on guinea pigs have occurred on several occasions since the establishment of the colony in 1958. No ringworm infection bas occurred in persons handling the animals. The hygiene procedures used in this colony are described. Suggestions for eradicating the infection are discussed and the public health aspect mentioned.