[Clinical and pathomorphological studies of rabbits injected with virulent and lapinized swine plague virus].

Investigations were carried out to establish the clinical and morphological reactions in rabbits following the consecutive infection with the virulent Vratsa strain and the lapinized K strain of the swine fever virus. It was found that although the virulent strain did not cause a thermal response there were morphological lesions in the body of the rabbits, characterizing the presence of an immune response. The latter was shown to inhibit the thermal reaction in the animals after infecting with lapinized strain. It is stated that such inhibition of the thermal reaction which is typical for strain K is invariably generated if the lapinized virus is injected 120 hours after the injection of the virulent virus.