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  • Title: Monoclonal antibody characterization of two field strains of Haemophilus paragallinarum isolated from vaccinated layer hens.
    Author: Verschoor JA, Coetzee L, Visser L.
    Journal: Avian Dis; 1989; 33(2):219-25. PubMed ID: 2751552.
    Abstract:
    An oil-based bacterin, containing strains 083 and 0222 of Haemophilus paragallinarum, is commonly used in South Africa to vaccinate laying flocks against infectious coryza. Two strains of H. paragallinarum, designated M85 and SB86, were isolated from infected but vaccinated commercial laying flocks in two incidental outbreaks of coryza in 1985 and 1986. A panel of five monoclonal antibodies was established which clearly distinguished the vaccine strains from the field isolates. One of these reacted with only vaccine strains A and B, another reacted with only field strains M85 and SB86, and the remaining three cross-reacted to various degrees with all four strains or isolates. Immunoassays were performed by enzyme-linked immunosorbent assay using whole bacteria as solid-phase antigen. These monoclonal antibodies may aid in serotyping new field isolates of H. paragallinarum and in improved standardization of vaccine strains.
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