Dr. Stephen C. Barr offers testing and interpretation tips that help in identifying leptospirosis in dogs.
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Reference: Barr SC, McDonough PL, Scipioni-Ball RL, Starr JK. Serologic responses of dogs given a commercial vaccine against Leptospira interrogans serovar pomona and Leptospira kirschneri serovar grippotyphosa. Am J Vet Res 2005;66(10):1780-1784.