. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). io8 Bulletin 2cco. W- ""^v In tuberculosis we have similar conditions, but they differ in detail from those in diphtheria in three very important points,— the length of the period of incubation, the way in which the specific bacteria pro- duce the disease, and the time re- quired for the disease to run its course. With diphtheria the speci- fic bacteria produce a toxm which poisons the system, and this toxin is t
. Annual report of the Cornell University Agricultural Experiment Station, Ithaca, Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). io8 Bulletin 2cco. W- ""^v In tuberculosis we have similar conditions, but they differ in detail from those in diphtheria in three very important points,— the length of the period of incubation, the way in which the specific bacteria pro- duce the disease, and the time re- quired for the disease to run its course. With diphtheria the speci- fic bacteria produce a toxm which poisons the system, and this toxin is the cause of death. In tubercu- losis, the specific bacteria, do not produce such a toxin, but they live in one or more of the tissues of the body, multiply there, and by their increase penetrate deeper and deeper into the organs of the body, destroying the tissues as they go. Finally the injured organs give rise to symptoms, at first slight, but gradually they become more and more serious until death is pro- duced, because some organ neces- sary for the life of the individual has been destroyed. While diph- theria completes its course in a few days or weeks, tuberculosis re- quires for the same purpose months and more often years. It is important that both the specific, and the infectious, nature of bovine tuberculosis should be understood. It is a specific disease because it is pro- duced by a single cause—the tubercle bacillus. It is in- fectious because the tubcr- Fici. 128.— I Iw carcass uf an auiiiial killed for cle bacteria, the organisms beef shotviiii^ tuberculosis of the liver, oineiiliDii ,, , , ,, ,. and lungs. Generalised tuberculosis (Reynolds). '^^^^^ produce the disease, must first be taken into the. ^v. 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 Cornell University. Agricultural Exp
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