. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. Cattle Ticks and Texas Fever 223 00000 00000 Babesia bovis in blood corpuscles. After Calli. they were given the generic name Pyrososma and because they were usually found two in a corpuscle, the specific name, bigeminum. It is now generally accepted that the parasite is the same which Babes had observed the year before in Roumanian cattle sufferingfrom haemoglobinuria, and should be known as Babesia bovis (Babes). By a series of perfectly con- clusive experiments carried on near Washington, D
. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. Cattle Ticks and Texas Fever 223 00000 00000 Babesia bovis in blood corpuscles. After Calli. they were given the generic name Pyrososma and because they were usually found two in a corpuscle, the specific name, bigeminum. It is now generally accepted that the parasite is the same which Babes had observed the year before in Roumanian cattle sufferingfrom haemoglobinuria, and should be known as Babesia bovis (Babes). By a series of perfectly con- clusive experiments carried on near Washington, D. C, Smith and Kilboume showed that this organism was carried from Southern cattle to non-immune ani- mals by the so-called Southern cattle tick, Boophilus annulatus (= Mar- garopus annulatus) (fig. 139). Of fourteen head of native cattle placed in a field with tick-infested Northern cattle all but two contracted the disease. This experiment was repeated with similar results. Four head of native cattle kept in a plot with three North Carolina cattle which had been carefully freed from ticks remained healthy. A second experiment the same year gave similar results. Still more conclusive was the ex- periment showing that fields which had not been entered by Southern cattle but which had been infected by matvtre ticks taken from such animals wotdd produce Texas fever in native cattle. On September 13, 1889, sev- eral thousand ticks collected from cattle in North Carolina three and four days before, were scattered in a small field near Washington. Three 139. The cattie tick (Boophilusannulatus). f {• .. • 1 1 J • {a\ Female; (6) male. After out of four native animals placed m 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 Riley, William A. (William Albert), b. 1876; Johanssen, Oskar Augustus, 18
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