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Sprague LD, Neubauer H.Sprague LD, et al.J Vet Med B Infect Dis Vet Public Health. 2004 Sep;51(7):305-20. doi: 10.1111/j.1439-0450.2004.00797.x.J Vet Med B Infect Dis Vet Public Health. 2004.PMID: 15525357Review.