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  • Title: Infectious coryza: in vivo growth of Haemophilus gallinarum as a determinant for cross protection.
    Author: Rimler RB, Davis RB.
    Journal: Am J Vet Res; 1977 Oct; 38(10):1591-3. PubMed ID: 931141.
    Abstract:
    Four strains of Haemophilus gallinarum representing 3 immunotypes were used in exposure and challenge exposure studies to determine if in vivo growth of the organism would induce cross protection in chickens. Birds which recovered from infection to 1 immunotype were refractory to reinfection with the heterologous immunotype. In contrast, in vitro-produced bacterins produced immunotype-specific protection.
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