Diseases of swine, with particluar reference to hog-cholera . ion are injectedinto the peritoneal cavity of the virus animal. Two hours laterthe animal is killed and the salt solution recovered from the abdo-men. This method is used by Dr. Craig at Purdue University,but does not seem to meet with any very general favor by otherserum manufacturers. Dr. Craig, however, reports very goodsuccess with the method, and the serum produced at the Purdueplant is well above the average in quality. Still another means of 342 DISEASES OF SWINE obtaining virus is to place healthy shoats in an infected feed
Diseases of swine, with particluar reference to hog-cholera . ion are injectedinto the peritoneal cavity of the virus animal. Two hours laterthe animal is killed and the salt solution recovered from the abdo-men. This method is used by Dr. Craig at Purdue University,but does not seem to meet with any very general favor by otherserum manufacturers. Dr. Craig, however, reports very goodsuccess with the method, and the serum produced at the Purdueplant is well above the average in quality. Still another means of 342 DISEASES OF SWINE obtaining virus is to place healthy shoats in an infected feed lotand allow them to contract the disease. These shoats are thenbled in the usual manner and the blood so obtained used for in-jection purposes. Regardless of the method of securing virus that may be used,a postmortem examination should be made of the virus pigs afterslaughter. All the organs usually affected by hog-cholera shouldbe examined and their condition noted. The skin should be notedfor evidences of discoloration; the lymph-glands should be exposed. Fig. 62.—Exterior of bleeding room at H. K. Mulford plant, Philadelphia. and swelling and congestion looked for; the organs of the abdomi-nal and thoracic cavities should be observed, and especially thecondition of the intestines, spleen, lungs, and kidneys. Thereshould be sufficient evidence to warrant a diagnosis of cholera,and the more acute in type the disease appears to have been, themore available the virus. Evidence of mixed infection, or of asevere jaundice, is undesirable, and blood from such animalsshould not be used for virus injections. Especially should thisbe the case if there are any signs of abscess formation in the body MANUFACTURE OF HOG-CHOLERA SERUM 343 or any evidence of blood-poisoning. Slight pneumonia is permis-sible, but I question if blood should be used where there is markedconsolidation of one entire lung or of both lungs. The objectshould be to obtain a virus that is absolutely pure, and of ju
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