. Special pathology and therapeutics of the diseases of domestic animals. Veterinary medicine. Pathogenicity. 807 The infection fs ti^nsmitted by the so-called tsetse fly, which somewhat resembles the house fly although it is some- what larger, principally by the glossina morsitans (Fig. 142), in such a way that it sucks blood from the infected animal, and then carries the parasites into the body by its bite. Freshly molted flies are harmless, if however they have alighted upon an affected animal only a single time they may transmit the disease and trypanosomes may be demonstrated in their pro
. Special pathology and therapeutics of the diseases of domestic animals. Veterinary medicine. Pathogenicity. 807 The infection fs ti^nsmitted by the so-called tsetse fly, which somewhat resembles the house fly although it is some- what larger, principally by the glossina morsitans (Fig. 142), in such a way that it sucks blood from the infected animal, and then carries the parasites into the body by its bite. Freshly molted flies are harmless, if however they have alighted upon an affected animal only a single time they may transmit the disease and trypanosomes may be demonstrated in their pro- boscis and stomach shortly after sucking the blood. By the transportation of affected flies the disease was successfully produced in previously non-infected localities, while on the other hand animals driven during the day in infected localities became affected even when they had not partaken of food nor water while en route. Furthermore, the extension of the in- fected territory corresponds accurately with the geographical distribution of the tsetse fly (between the 10th deg. north, and 30 deg. south latitude), where its appearance in great numbers is usually followed by severe Fig. 142. Glossina morsitans. A with closed, B with spread wings, 0 anterior part in profile. A and B enlarged tiifies. (After Bruce.) Where affected animals are present or those which have passed through the disease within a short time, the fly is afforded ample opportunity for taking up trypanosomes; flies may also obtain the infectious material from wild animals (buffaloes, antelopes, hyenas, zebras and quaggas), in the blood of which it may occur as a harmless parasite. The tsetse fol- lows these animals everywhere; with the appearance of the summer season the infectious material is then taken from them by the young flies, and transmitted to domestic animals, while with the eradication of the game the tsetse fly also disappears, so that infected territories may thus become free. Ac
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