STUDIES ON CANINE MALASSEZIAL INFECTIONS AND ITS THERAPY
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Date
2006-10
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT :
The incidence of Malassezial infections in three veterinary hospitals in Andhra Pradesh was studied during a total period of seven months. An over all incidence rates of 80.82% of Malassezia associated otitis and 7.14% of Malassezia dermatitis were recorded during the study period. The incidence of Malassezia associated otitis was 83% in Tirupati, 82% in Kakinada and 60% in Vijayawada. The incidence of Malassezia dermatitis was 11.90% in Tirupati and 10.45% in Kakinada and there was significant difference (P<0.01) between the incidence of Malassezia associated otitis and dermatitis. It was observed that Malassezial infection in the form of otitis was more common than in the form of dermatitis. Age wise incidence of Malasseziosis revealed that dogs upto twenty four months age group were more prone to Malassezia associated otitis and dermatitis. Sex wise analysis revealed that gender has got no significant influence on the incidence of Malassezial infections. Breeds of Dachshund, Labrador, Lhasa Apso, German shepherd and Pomeranians were more prone to Malassezial infections. Symptoms such as ear discharges of purulent or waxy nature, bad odour, head shaking, ear scratching, pain on palpation of ear, matting of hair intruding the ear canal and hair present at the base of the pinna and scales on the pinna were seen in Malassezia associated otitis. Alopecia, pruritus and erythema over ventral abdomen, neck, medial aspects of fore legs and mandibular region, poor hair coat, lichenification of ear were seen in Malassezia dermatitis. Roll smear cytology was made use of in the diagnosis of Malassezia associated otitis while tape impression smear for Malassezia dermatitis. In cases selected for therapy, Malassezia were seen in association with bacteria and neutrophils in eight cases and with only bacteria in eight more cases. Tape impression smears from dermatological cases revealed only Malassezia yeasts. Antifungal and antibiotic sensitivity tests were carried to all the otitis cases selected for therapy as bacteria was observed in all these cases along with the yeast organisms. Only antifungal sensitivity test was conducted in dermatological cases as only yeast but not bacteria could be found in tape impression smears. All the samples from Malassezia associated otitis were sensitive to Ketoconazole, Fluconazole, Miconazole, Itraconazole, Clotrimazole, Amphotericin-B and Nystatin. All samples (100%) from dermatological cases were sensitive to Ketoconazole and Clotrimazole, 75% were sensitive to Fluconazole, Itraconazole and Nystatin and 62.50% to Amphotericin-B. Antibiotic sensitivity test results of otitis cases revealed that all the samples were sensitive to Enrofloxacin, 88% showed sensitivity to Ciprofloxin and Gentamicin, 75% to Cephalexin and Cephadroxil, 69% to Chloramphenicol and 62.5% to Amoxycillin-clavulanic acid. Dogs with Malassezia associated otitis were divided into two groups (I and II) with eight cases in each of them. Similarly, eight cases of Malassezia dermatitis (Group III) were treated separately. Therapy of Malassezia associated otitis was carried with Clotrimazole ear drops, Ketoconazole shampoo bath and oral Enrofloxacin in group I and Clotrimazole ear drops, Selenium sulfide shampoo bath and oral Enrofloxacin in Group II. Dogs with Malassezia dermatitis were subjected to Miconazole shampoo therapy and in one case with lichenification, oral Ketoconazole was given besides Miconazole shampoo bath. It was observed that cases treated with Clotrimazole, Ketoconazole and Enrofloxacin recovered comparatively faster. Treatment with Miconazole shampoo was found to be successful in seven cases with mild symptoms of Malassezia dermatitis. However, one case with lichenification of ears responded well only after oral Ketoconazole therapy. It is concluded that Clotrimazole ear drops in combination with Ketoconazole was comparatively more efficacious in the treatment of Malassezia associated otitis. Mild cases of Malassezia dermatitis could be treated with Miconazole shampoo therapy.
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