Afrim  Hamidi, Driton  Sylejmani, Avni  Robaj, 
    Investigation and Antimicrobial Susceptibility of
Microbial Agents of External Otitis in Dogs,
    Journal of Animal and Veterinary Advances,
    Volume 14,Issue 10,
    2015,
    Pages 277-280,
    ISSN 1680-5593,
    javaa.2015.277.280,
    (https://makhillpublications.co/view-article.php?doi=javaa.2015.277.280)
    Abstract: The purpose of this research was to investigate the presence of secondary bacterial or yeast
contamination of otitis externa in dogs and to analyze the antimicrobial susceptibility of those microorganisms.
Clinical manifestations of external otitis were evaluated. Samples from the ear canal of 42 dogs with otitis externa
were submitted to direct microscopic examination and cultured in blood agar and Sabouraud dextrose agar with
chloramphenicol and cycloheximide. Otitis externa was more frequent in dogs between 2 and 5 year old 19 cases
(55.9%) followed by up to 2 years 9 cases (26.5%). The most common dog breeds affected from otitis externa
were crossbred (23.8%), German shepherd (16.6%) followed by cocker spaniel (14.3%) and Fox terrier (11.9%).
Among 42 swab ear samples from dogs with otitis externa, microorganisms were isolated in 50% of cases as
mono-infections (21 cases), involving mainly <i>Staphylococcus pseudintermedius</i> (10 cases), followed by
<i>Malassezia pachydermatis</i> (8 cases), <i>Streptococcus spp</i>. (2 cases) and <i>Staphylococcus aureus</i> (one case) and
other cases (13) as poly-infections (31%). The other microbial agents <i>Proteus mirabilis</i> in 4 cases,
<i>Pseudomonas aeruginosa</i> in 5 cases and <i>Staphylococcus aureus</i> in 2 case were found also in poly-infection.
All of the bacterial isolates tested were highly susceptible to amoxicillin-clavulanic acid, gentamycin,
chloramphenicol and resistant to ampicillin, lincomycin and streptomycin.
    Keywords: otitis externa;microbial agents;Antimicrobial susceptibility;dogs;Europe