Milk and its relation to the public health . ows from showing itself byexternal symptoms. An example of this is seen in illustration No. 15,which shows a cow affected with advanced tuberculosis. The tuberculous disease of the cow represented in the picture ispartly located in the glands of her throat; the enlarged glands presson and narrow the passage through which air reaches her lung tosuch an extent that she almost dies of suffocation when she is drivena short distance at a moderately fast walk. The general conditionof the cow shows that the opening through which the air she breathesmust pa
Milk and its relation to the public health . ows from showing itself byexternal symptoms. An example of this is seen in illustration No. 15,which shows a cow affected with advanced tuberculosis. The tuberculous disease of the cow represented in the picture ispartly located in the glands of her throat; the enlarged glands presson and narrow the passage through which air reaches her lung tosuch an extent that she almost dies of suffocation when she is drivena short distance at a moderately fast walk. The general conditionof the cow shows that the opening through which the air she breathesmust pass is still large enough for ordinary purposes; the differencebetween its original and its present size is a factor of safety that hasbeen almost wholly lost. We may conclude that, with few exceptions, the character of tuber-culosis among cattle is that of an effectually concealed disease, thedetection of which before it is well advanced and has done greatharm is practically impossible through the agency of our unaidedpowers of 533 Fortunately we have in the substance known as • tuberculin anexcellent agent for detecting tuberculosis in cattle when all othermeans of diagnosis fail. THE MANNER IN WHICH TUBERCLE BACILLI ARE EXPELLED BYTUBERCULOUS CATTLE. Examinations made at the experiment station of the United StatesBureau of Animal Industry showed that tuberculous cows expeltubercle bacilli more commonly with their feces than in other also expel them with the material drooled and slobbered fromtheir mouths during feeding and ruminating; with the particles offluid sprayed from their mouths and noses during accelerated expira-tory acts; and directly with their milk when their udders are authorities assert that tubercle bacilli are expelled directly withthe milk when the udder is free from disease, but the observationsof the experiment station indicate that this does not occur unlesscows are affected with otherwise generalized, advanced tub
Size: 1485px × 1683px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1912
