Studies on fungal flora in hair from domestic and laboratory animals suspected of dermatophytosis. I. Dematophytes.

This study analyses the presence of dermatophytes, a particular type of fungus, in hair samples from domestic and laboratory animals suspected of having a skin infection known as dermatophytosis. A specially developed medium was used to isolate and identify the fungus, with certain other mediums employed in some cases. Dermatophytes were found in about 11% of the tested samples, with varied types found in different animals. Certain breeds of cats had a higher frequency of the infection, and two cases were linked to human infections.

Understanding the Research Approach

• The researchers gathered hair samples from different animals including cats, dogs, horses, guinea pigs and rabbits. These animals were already suspected of suffering from dermatophytosis, a skin infection caused by a group of fungi known as dermatophytes.
• In order to detect the presence and type of dermatophytes, the scientists used a particular base-medium that was low in nutrients. This medium was developed by the study author and effectively facilitated the isolation and identification of the fungus.
• For some special cases, they also used a casein-medium supplemented with vitamins and what is known as a Sabouraud-liquid medium.

Key Findings

• In total, dermatophytes were isolated from 36 out of 331 samples, indicating a detection rate of approximately 10.9%.
• The types of dermatophytes found varied depending on the animal. For instance, the Microsporum canis type was mostly found in cats, but also in dogs and horses. On the other hand, the Trichophyton mentagrophytes var. granulare type was isolated from dogs, horses, guinea pigs, and rabbits. The Trichophyton terrestre type was only found in a dog.
• The researchers noted that a large portion (11 out of 13) of the feline isolates were from domestic, or house cats. Moreover, they found that purebred cats showed a higher relative frequency of the infection.
• The study findings also included an important note about the potential for this fungus to cross species: two of the dermatophyte isolates from cats were linked with human cases of dermatophytosis.

Implications of the Study

• The study demonstrates the usefulness of the nutritionally poor base-medium used for identifying and isolating dermatophytes in animals.
• The findings also reveal the presence of different types of dermatophytes in different animals, providing valuable information on the epidemiology of dermatophytosis.
• In addition, the research sheds light on the potential of cross-species transmission of the dermatophytes from pets to humans.