. [Publications] - Bureau of Government Laboratories. Biology; Medicine; Natural history. 124 The disease in these animals in the Philippine Islands is of longer duration, just as is true in other infected zones. This fact might be taken advantage of in bettering conditions in countries where surra is prevalent and where means of eradication and prevention are not appli- cable, because these animals may be used for a long time without becom- ing useless through exhaustion incident to the disease. Mules are largely used as draft animals by the Military and Civil Governments of the Philippine Is
. [Publications] - Bureau of Government Laboratories. Biology; Medicine; Natural history. 124 The disease in these animals in the Philippine Islands is of longer duration, just as is true in other infected zones. This fact might be taken advantage of in bettering conditions in countries where surra is prevalent and where means of eradication and prevention are not appli- cable, because these animals may be used for a long time without becom- ing useless through exhaustion incident to the disease. Mules are largely used as draft animals by the Military and Civil Governments of the Philippine Islands and are being introduced to an increasing extent in private enterprises. By inoculation they are just as susceptible to Trypanosomatic infec- tion as horses, but they appear to be less frequently attacked by natural infection; this is no doubt partly owing to the fact that flies disturb them less. The symptoms in general are similar to those described for the horse, but there are certain slight differences. The temperature is less remittent and more rarely intermittent, and we have not seen a single case in which the fever was of a relapsing, type. Edema, weakness, and anemia are. Fig. 124.—Nagana in the ass. (- -) Temperature. ( ) Trypanosoma, (After Laveran and Mesnil, 1902, fig. 3.) slower in their appearance, but when once well established show no sug- gestive differences. (See figures in preliminary report.) The parasites, as determined by microscopic examination, as a rule are not so numerous in the peripheral circulation as they are in that of the horse, and the periods during which they are not found at all are more frequent and of longer duration. However, just as in horses, the blood is constantly infectious by inoculation throughout the course of the disease. The incubation period is the same as in the horse, the duration from four to twelve weeks or even longer, and the mortality 100 per cent. As a general rule, skin lesions are more constant and decided tha
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