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METHOD OF OBTAINING A VACCINE AGAINST SWINE PLEUROPNEUMONIA WHICH CONTAIN STRAINS OF ACTINOBACCILUS PLEUROPNEUMONIAE IN PARTICULAR THOSE OF 1,5,9 SEROTYPES
METHOD OF OBTAINING A VACCINE AGAINST SWINE PLEUROPNEUMONIA WHICH CONTAIN STRAINS OF ACTINOBACCILUS PLEUROPNEUMONIAE IN PARTICULAR THOSE OF 1,5,9 SEROTYPES