Bovine dermatophytosis is a zoonotic cutaneous mycosis caused by fungi of the genera Microsporum and Trichophyton, with a wide global distribution. It most frequently affects young animals and produces characteristic lesions such as circular alopecia, grayish crusts, and scaling, primarily on the head and neck. Transmission occurs through direct contact, contaminated fomites, insects, and ectoparasites. Asymptomatic animals can serve as reservoirs of the fungus, which can survive for long periods in the environment. This report aims to describe a case of dermatophytosis in a mixed-breed Nelore steer raised extensively in semi-arid region of Pernambuco, Brazil. The animal exhibited typical lesions, and the diagnosis was confirmed by cytology of a skin scraping, in which macroconidia and spores were observed. Treatment consisted of topical glycerinated iodine and systemic Ceftiofur Hydrochloride, resulting in marked clinical improvement and complete recovery within 30 days. Early diagnosis and the combination of antifungal and antibiotic therapies are essential for controlling secondary bacterial infections. Although qPCR is a more modern diagnostic method with high sensitivity and specificity, cytology proved effective and more accessible under field conditions. Prophylactic measures, including the isolation of affected animals, disinfection of facilities, and control of animal introductions, are essential to prevent outbreaks and protect public health, given the zoonotic potential of dermatophytosis. It is concluded that the combined treatment and the preventive measures adopted were effective in the recovery of the animal and in preventing the spread of the disease. Continuous surveillance and appropriate sanitary management are fundamental for the control of dermatophytosis.
Leão et al. (Wed,) studied this question.