Swine immunization using live, RTX toxin-secreting organisms

Drug – bio-affecting and body treating compositions – Antigen – epitope – or other immunospecific immunoeffector – Bacterium or component thereof or substance produced by said...

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4241841, 4242561, 4242571, 4242581, 4242341, 4242361, 424825, 4242411, 514 2, A61K 39102, A61K 3902, A61K 39205, A01N 3718

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059086300

ABSTRACT:
An improved method and vaccine is provided for the immunization of swine against infectious diseases caused by RTX toxin-secreting bacteria (e.g., porcine pleuropneumonia) which comprises administering to swine an effective amount of a live, immunizing, RTX toxin-secreting organism which induces in the swine a sufficiently high RTX toxin-neutralizing antibody titer to at least prevent clinical symptoms of the disease in the swine. For example, an intranasally administered, live, low virulence strain of A. suis (EM1) confers immunity upon swine against challenge with a virulent, disease-causing strain of A. pleuropneunmoniae.

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