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  • Title: Behaviour of S. paratyphi A in mice immunized with homologous and heterologous bacterial proteins.
    Author: Eylan E, Barber C.
    Journal: Zentralbl Bakteriol Orig A; 1978 Nov; 242(1):12-6. PubMed ID: 83751.
    Abstract:
    Mice immunized with proteins from S. typhimurium and from S. paratyphi C resisted the toxicity of a concentration of S. paratyphi A which killed the controls; this is in contrast to the results found in mice immunized with the same amount of proteins from the homologous S. paratyphi A. For the neutralization of the S. paratyphi A toxicity a higher quantity of homologous proteins was necessary in the immunizations. It is assumed that either S. paratyphi A synthesizes--on artificial media--a small amount of proteins responsible for the induction of neutralizing antibodies or that it is an intrinsic weak immunogen. In the sera of mice in which sufficient neutralizing antibodies were induced, the proteins of S. paratyphi A cross-reacted in agar-gel, with the proteins from S. typhimurium and from S. paratyphi C.
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