Question of the Day
Friday March 05th, 2010A ewe is examined because of a large swelling on the shoulder. On evaluation the swelling is fluctuant and has a draining purulent discharge. Other sheep in the herd have nonpainful subcutaneous swellings on the neck and shoulder.
A few animals in the herd appear emaciated.
What is the best way to confirm a presumptive diagnosis of caseous lymphadenitis?
A - ELISA test for antibodies to Pasteurella multocida from a serum sample
B - Isolation of Corynebacterium pseudotuberculosis from an aspirate
C - Serologic testing for phospholipase D exotoxin
D - PCR for capsular antigen A1
E - Fecal culture of Mycobacterium ovis
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