. Clinical bacteriology and vaccine therapy for veterinary surgeons. Veterinary bacteriology; Vaccines. 62 CLINICAL BACTERIOLOGY AND Method.—Take a mixture of the bacterial emulsion and mix with it a small quantity of serum from an animal immune to the bacterium in question, and inject into the peritoneal cavity of a healthy guinea-pig. After half an hour the peritoneal fluid and exudate is micro- scopically examined; and if the reaction is a positive one the organisms will be found to have undergone degenera- tion, in which case the organism will be found to belong to the same species as the
. Clinical bacteriology and vaccine therapy for veterinary surgeons. Veterinary bacteriology; Vaccines. 62 CLINICAL BACTERIOLOGY AND Method.—Take a mixture of the bacterial emulsion and mix with it a small quantity of serum from an animal immune to the bacterium in question, and inject into the peritoneal cavity of a healthy guinea-pig. After half an hour the peritoneal fluid and exudate is micro- scopically examined; and if the reaction is a positive one the organisms will be found to have undergone degenera- tion, in which case the organism will be found to belong to the same species as the one which the already immunized animal was invaded by. On the other hand, if the reaction. Fig, 30.—A, Micro-organism ; B, Immune Body or .Amboceptor; C, Complement (Ehrlich). is a negative one the organism belongs to a different species to that by which the animal was immunized. Opsonins. Wright has shown there exists in blood-serum an anti- body which possesses the specific virtue of sensitizing the bacteria present, and in this manner prepares them for the devouring activities of the leucocytes. He calls this antibody " opsonin," or " ; It appears this opsonic power which the serum exerts upon each kind of bacterium is a specific one, for we find if an animal is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Scott, William, 1873-. Chicago : A. Eger
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