Frequency of Dermatitis Associated with Nematode in Stray Dogs in Merida, Yucatan, Mexico
Departamento de Medicina Interna y Cirugía. Facultad de Medicina Veterinaria y Zootecnia. Universidad Autónoma de Yucatán
The purpose of the study reported here was to estimate the frequency of skin lesions (dermatitis) associated with parasite infestation by nematode in stray dogs. A total of 70 stray dogs admitted to the Dog Track of Merida, Yucatan, Mexico, were used in the study. These dogs were sacrificed using humanitarian procedures following approved federal Mexican regulations (NOM-033-ZOO-1995). For diagnosis of skin lesions, two skin biopsies from different anatomic sites were taken (punch, 6 mm diameter). Biopsies were processed for diagnosis of dermatitis using standard histopathologic techniques (including use a 10% formaldehyde solution, paraffin, and HE staining techniques) (Luna, 1964; Muller, et al., 1991; Jubb, et al., 1993).
In the histopathologic exam, 39 (55%) dogs were diagnosed with dermatitis; 2 of the 39 dogs with dermatitis had lesions in an interphase stage, 20 showed peri-vascular lesions, 17 had nodular lesions, and 6 had presence of nematodes (e.g., Ancylostoma and Microfilariae) (Cordero del Campillo, et al., 1999; Hargis, et al., 1999; Bolio, et al., 2002; Tarello, 2003).
To our knowledge, this is the first report on the frequency of skin lesions in stray dogs by Ancylostoma and Microfilariae, in the Peninsula of Yucatan. Analysis of study results reported here indicate that dermatitis is a frequent disease in stray dogs in the city of Merida. Small animal clinicians should be aware of the high frequency of skin lesions in stray dogs and help educate the public on the potential zoonotic implications of human exposure (contact) with stray dogs.
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