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In animals with in ammatory joint disease, an
underlying cause may or may not be identi ed. In dogs and cats, most in ammatory joint disease involves multiple joints and often has an immune-mediated component to the disease. Most infectious related joint disease in the dog involves a single joint. Exceptions include polyarthropaties associated with tick-borne illnesses such as Borrelia burgdorferi, Anaplasma phagocytophilum and Ehrlichia ewingii. In the cat, viral arthropathies may occur in which case, infectious agents will not be identi ed and the in ammation may either be neutrophilic, macrophagic, or lymphocytic.
In summary, analysis of synovial  uid will allow the distinction between a patient with in ammatory vs. Nonin ammatory joint disease. Only occasionally will a de nitive diagnosis be obtained by synovial  uid analysis alone. Therefore, once the disease process is classi ed as in ammatory or nonin ammatory, further analysis to determine an underlying cause must be explored.
An Urban Experience

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