. Special pathology and therapeutics of the diseases of domestic animals. Veterinary medicine. 770 Piroplasmosis of Cattle. cattle, the piroplasma appear in the blood in about eight days, and in some eases fever and hemoglobinuria sets in (Fig. 133), The results of experiments conducted with nymphs which as larvae sucked blood from affected cattle, are similar, and the disease may be also produced with larvae, which have wintered in the open (the infectiousness of the sexually mature ticks of the species described here is as yet questionable).. According to these experimental results, which co
. Special pathology and therapeutics of the diseases of domestic animals. Veterinary medicine. 770 Piroplasmosis of Cattle. cattle, the piroplasma appear in the blood in about eight days, and in some eases fever and hemoglobinuria sets in (Fig. 133), The results of experiments conducted with nymphs which as larvae sucked blood from affected cattle, are similar, and the disease may be also produced with larvae, which have wintered in the open (the infectiousness of the sexually mature ticks of the species described here is as yet questionable).. According to these experimental results, which correspond with practical observations, the natural infection of cattle occurs usually on previously infected pastures in which one of the mentioned species of ticks are present, and in which the larvae and nymphs originated from females which had the opportunity to suck blood from affected animals or in which the nymphs themselves in a previous stage of development sucked infected blood. As these ecto-parasites subsist as a. Fig. 133. Fever curve in piroplasmosis of cattle. After placing several thou- sand infected larvae on the animal. (After Kossel, Schfltz, Weber & Miessner.) rule in marshy places, especially in forest pastures or near forests and bushes, the disease usually affects cattle driven to such pastures. On the other hand its annual reappearance may be explained by the facts that the virus passes from the impregnated female ticks to their progeny, and that they are capable of offering considerable resistance to unfavorable weather conditions, especially the cold of winter. If at the onset of warmer weather the larvae have already hatched from the eggs, the first cases of disease among cattle driven, to in- fected pastures usually appear after two weeks and, in case the respective pasture was badly infected the previous year, a great number of the animals may become affected within a short time. With stable feeding, however, the disease is observed only very exce
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