...Absolute safetyagainst this contagion is secured only by a total avoidance ofthe walks of the infected animals, till repeated rains, or whatis better, frosts, have disarmed the virus of its malignity... 
Richard L. Allen 「Domestic Animals」
...They may infect others directlyor they may scatter the virus about, and the surroundings may become a futuresource of infection for healthy animals...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...It is regarded as safe practice to use onlyspore-destroying substances for the virus of those diseases of which we have nodefinite knowledge...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The exact nature of the virus or contagion of lung plague has never beendetermined...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The observations made by some veterinarians would lead us to suppose thatthe virus is quite readily destroyed...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...It now appears that there is no hope ofgetting rid of it until the virus has worn itself out...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The saliva contains the virus, which, undernatural conditions, is introduced into or under the skin on the tooth of therabid animal...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Of late tubercular disease of the udder in cows () has received considerable attentionfrom sanitarians, owing to the infection of the milk with the virus oftuberculosis...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...It has long been known that theanthrax virus thrives best under certain conditions of the soil and onterritories subject to floods and inundations...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Slight wounds into which the virus may findaccess may be caused by barbed wire, stubbles, thorns, briers, grass burs, andsharp or pointed parts of feed...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...At the third or fourth generation, the virus, modified and attenuated inits infectious principles, would no longer have been mortal in itseffects, as experience has proved in Russia...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...The virus thus attenuated would have supplied the means of a practicalinoculation on a large scale to all healthy animals...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...The whole of the animal's body, therefore, no matter which fragment be submitted to the steeping process, yields the virus that so greatly pricks my curiosity...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
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