Archive image from page 451 of The dairyman's manual; a practical. The dairyman's manual; a practical treatise on the dairy dairymansmanualp01stew Year: 1888 446 THE dairyman's MANUAL. and, if care is not taken, are broken and may become raw sores which are difficult to heal, which, in fact, sometimes result very disastrously and even fatally. By and by the contained liquid becomes a thick yel- lowish pus vdiich dries into a scab, and this in time becomes loose and falls off, being replaced by newly- formed skin. When one case is out of the way another appears, and in a herd of twenty or more
Archive image from page 451 of The dairyman's manual; a practical. The dairyman's manual; a practical treatise on the dairy dairymansmanualp01stew Year: 1888 446 THE dairyman's MANUAL. and, if care is not taken, are broken and may become raw sores which are difficult to heal, which, in fact, sometimes result very disastrously and even fatally. By and by the contained liquid becomes a thick yel- lowish pus vdiich dries into a scab, and this in time becomes loose and falls off, being replaced by newly- formed skin. When one case is out of the way another appears, and in a herd of twenty or more it may continue the whole summer in its passage through the herd, giving constant annoyance. During the progress of the disease the udder is inflamed and tender, and the teats are quite painful when pressed; so much so that milking Fig. 105.—APPEARANCE OF COW POX. A.—MILKING TUBE. in the usual manner is impossible. Recourse is then had to milking tubes. This disease is readily communicated to mankind and to horses, and spreads from cow to cow, being usually conveyed by the milker, whose hands and clothing soon become infected with the virus. The matter contained in the vesicles is the true vaccine virus used for inoculat- ing persons as an antidote to the more dreaded and viru- lent small-pox, and in its effect upon mankind occasions no worse disturbance than the slight fever and some- times glandular swellings incident to the operation of vaccination. The virus will often remain permanently in a stable, and will cause every heifer which comes to milk in it to contract the disease, When this is found
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