Malassezia Species Overgrowth in Allergic Cats

The document reports on a study of 18 allergic cats suffering from an overgrowth of Malassezia spp., a type of yeast. Out of these, 16 were diagnosed with atopic dermatitis, one with an adverse food reaction, and one was euthanized. All cats were tested negative for feline leukemia and feline immunodeficiency virus. The cats exhibited symptoms such as multifocal alopecia, erythema, crusting, and greasy brownish scales. Malassezia spp. overgrowth, sometimes accompanied by bacterial infection, was confirmed through cytological examination in various skin areas. Two cats also had Malassezia pachydermatis isolated from their skin. Treatment with azoles, sometimes combined with antibacterial and anti-inflammatory therapy, led to a significant reduction in pruritus and skin lesions after 3-4 weeks, particularly in those receiving combined therapy. The study suggests that Malassezia spp. overgrowth is a secondary issue in allergic cats and that antifungal treatments can be effective in reducing symptoms.