. The veterinary bacteriological laboratories. Issued in commemoration of the opening of the new laboratories at Onderstepoort, Pretoria, October, 1908. Pretoria. Veterinary research laboratories; Veterinary medicine. IV. From a practical point of view, immunity against a tropical disease can only be spoken of as sufficient when it protects against the majority of various strains of the organisms forming the cause of the disease found in such region, for which it is intended to make use of for inoculation purposes. V. The immunity test for identifying two morphologically similar organisms can
. The veterinary bacteriological laboratories. Issued in commemoration of the opening of the new laboratories at Onderstepoort, Pretoria, October, 1908. Pretoria. Veterinary research laboratories; Veterinary medicine. IV. From a practical point of view, immunity against a tropical disease can only be spoken of as sufficient when it protects against the majority of various strains of the organisms forming the cause of the disease found in such region, for which it is intended to make use of for inoculation purposes. V. The immunity test for identifying two morphologically similar organisms can only allow of a definite conclusion when the test is positive, but not so when it is negative. VI. The seriim of animals which have recovered from a disease and have been hyperimmunised to a certain extent acquires preventive properties. East Coast fever is an exception, but the injection of blood from an animal suffering from East Coast fever into susceptible ones does not communicate the disease, and this may explain the fact. The preventive action of a serum is principally pronounced against a homologous strain, either of the same animal (virus derived from the same immune animal which supplied the serum ; in some trypanosomiasis and in canine piroplasmosis) or of difEerent animals and of different strain (horse-sickness); it may be deficient against heterologous strains (strains of different origin ; some trypanosomiases, surra, and horse-sickness) or even against a homologous strain derived from the animal which supplied the serum (some trypanosomiases). VII. Concerning the immunity itself, there are no essential differences between that caused by bacteria and that caused by protozoa. The fact that an apparently recovered animal acts as a reservoir has its analogy in pleuro-pneumonia of cattle, although the two cases are not quite identical. In the latter, riiorbid lesions are still present, in which the infective cause is retained; in the former, the cause remains in an a
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