title: A vaccine strain of Pasteurella multocida obtained by mutagenesis.
abstract: A virulent avian septicemia strain of Pasteurella multocida (P. multocida) serotype 1 was mutagenized with N-methyl-N'-nitro-N-nitroso guanidine. A selection procedure was devised to isolate mutants with changed growth properties. Mutants were isolated that had either prolonged doubling time or temperature sensitivity for growth at 41 degrees C. A correlation was observed between growth properties in vitro and multiplication in vivo. Mutants defective in growth were avirulent. A positive correlation was observed between the rates of multiplication of mutant strains in vitro and their ability to protect against heterologous challenge.
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines / Q000627:therapeutic use*; D051379:Mice; D009154:Mutation; D010325:Pasteurella / Q000254:growth & development; D010326:Pasteurella Infections / Q000517:prevention & control*; D013696:Temperature; D014422:Turkeys
chemical_list: D001428:Bacterial Vaccines