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5. Changes in the incidences of the different serovars of Haemophilus paragallinarum in South Africa: a possible explanation for vaccination failures. Bragg RR, Coetzee L, Verschoor JA. Onderstepoort J Vet Res; 1996 Sep; 63(3):217-26. PubMed ID: 8917859 [Abstract] [Full Text] [Related]