The veterinary medicinal product is an inactivated bacterial vaccine containing whole cell concentrate of Mycoplasma hyopneumoniae strain 11. This antigen is incorporated in an adjuvant based on a combination of light liquid paraffin and dl-α- tocopheryl acetate in order to give a prolonged stimulation of immunity. The product stimulates the development of active immunity in pigs against Mycoplasma hyopneumoniae.