. Common diseases of farm animals. Veterinary medicine. 320 INFECTIOUS DISEASES Vaccination of the exposed or susceptible animals should be practised. On farms where the disease exists it may be neces- sary to vaccinate the young animals (less than two years of age) once or twice every year in order to prevent the disease. Medic- inal treatment is unsatisfactory. Texas or Tick Fever.—Tick fever is an infectious disease of cattle. It is caused by an animal organism that is present in the blood, and is conveyed from the animal that is host for the tick fever parasite to the non-infected animal b
. Common diseases of farm animals. Veterinary medicine. 320 INFECTIOUS DISEASES Vaccination of the exposed or susceptible animals should be practised. On farms where the disease exists it may be neces- sary to vaccinate the young animals (less than two years of age) once or twice every year in order to prevent the disease. Medic- inal treatment is unsatisfactory. Texas or Tick Fever.—Tick fever is an infectious disease of cattle. It is caused by an animal organism that is present in the blood, and is conveyed from the animal that is host for the tick fever parasite to the non-infected animal by a tick (Figs, 120 and 121). Tick fever was introduced into the southern portion of the. Fig. 120.—Cattle tick (male). Fig. 121.—Cattle tick (female). United States through importation of cattle by the Spaniards. Previous to the establishing of a definite quarantine line between the permanently infected and the non-infected sections, heavy losses among northern cattle resulted through driving and ship- ping southern cattle through the northern States. The specific cause and the part taken by the tick in its distribution were not discovered until lS80-'90. Smith recognized and discovered the specific cause of the disease, and Kilborn and Salmon proved by a series of experiments that the cattle tick was respon- sible for the transmission of the disease from animal to animal. Tlie specific cause of tick fever is a protozoan parasite, Piro-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Craig, Robert Alexander, 1872-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookpublisherphilad, booksubjectveterinarymedicine, bookyear1919
