Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . known from the remotest antiquity. Itoccurs in dogs, foxes, wolves, horses, and other animals, and maybe transmitted from any of them to human beings. The contagium of rabies, the infective poison, is contained prin-cipally in the saliva, and is usually inoculated by the teeth of themad animal. 436 TEXT-BOOK OF HYGIENE. Pasteur has shown that the greatest virulence of the rabiespoison resides in the brain and spinal cord of the animal sufferingfrom the disease. By
Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . known from the remotest antiquity. Itoccurs in dogs, foxes, wolves, horses, and other animals, and maybe transmitted from any of them to human beings. The contagium of rabies, the infective poison, is contained prin-cipally in the saliva, and is usually inoculated by the teeth of themad animal. 436 TEXT-BOOK OF HYGIENE. Pasteur has shown that the greatest virulence of the rabiespoison resides in the brain and spinal cord of the animal sufferingfrom the disease. By attenuation of this virus, the nature of whichhas not yet been definitely determined, its virulence could be dimin-ished, and by inoculation of men and animals with the attenuatedvirus protection against the disease could be secured. The fact seemslikewise established that the period of incubation of the inoculation-rabies is much shorter than that acquired in the usual way by bites ofrabid animals. Hence, inoculation with the attenuated virus protectsthe bitten individual against the fatal outbreak of the Fig. 49.—Colony of Anthrax Bacilli, slightly Magnified.(After Fliigge.) Anthrax.—Anthrax, or splenic fever (milzbrand), is an acute,highly contagious and infectious disease of herbiverous animals,which may be transmitted by inoculation or the ingestion of the virusto other animals and to man. The disease is due to a minute vegetable organism which is foundin the blood and tissues of the diseased animals. This organism,Bacillus anthracis, was first discovered by Pollender, and has beenthoroughly investigated by Davaine, Pasteur, Koch, and others. Inoculation of these bacilli or their spores always produces thedisease in susceptible animals. Skins of animals not infrequentlycontain the virus, which may then gain access to the blood of personsengaged in handling them. Knackers, butchers, wool-sorters, and ANIMAL DISEASES COMMUNICABLE TO MAN. 437 other pe
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