Pseudomonas otitis externa in dogs

23 de dezembro de 2020

Otite externa por pseudomonas em cães

Charlie Pye

Otitis externa is a common complaint in veterinary medicine. In general practice, the percentage of canine cases
presenting for otitis externa ranges from 7.5% to 16.5% (1). Otitis externa is defined as inflammation of the external ear
canal consisting of the pinna, and the vertical and horizontal ear canals up to the level of the tympanum. In many instances
of otitis externa, secondary infection with bacteria or a fungus such as Malassezia pachydermatis, will be present. Pseudomonas
aeruginosa, Staphylococcus pseudintermedius, Escherichia coli, and Klebsiella spp. are among the most common bacterial pathogens
in cases of infectious otitis externa, with Pseudomonas aeruginosa being the most common Gram-negative isolate (1,2).
Pseudomonas aeruginosa is a ubiquitous Gram-negative bacillus found in soil, water, and decaying organic matter. It is not a normal inhabitant of the canine ear and when it leads to infection,
it can be challenging to manage (1,2). Selecting antibiotics for treatment can be problematic due to the bacterium’s resistance to
many classes of antibiotics, and treatment is further complicated by the growing number of multidrug resistant strains

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