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Parasites in Normal Blood
Parasites in lVormal Blood.
9
PARASITES IN NORMAL BLOOD. BY RICHARD W. BURKE, V.S., A.V.D., STATION VETERINARY HOSPITAL, CAWNPORE.
LEIDY, in 1858, in Philadelphia, described the Filaria immitis identical with the Filaria papillosa hrematica described by Delafond and Gruby (R ecueil de MCd. :Y ct., 1843, 1844, 1851). The fullgrown filaria, according to Krabbe (Repertor, 1871), reaches a length of IS to 30 em., and a thickness of one mm. Oreste (Gaz . ll1edic. Vet., 1874) found twenty-five examples in the right ventricle of the heart, which seemed to cause embolism and thrombosis described by Serres (Journal du Midi, 1854). In the left side of the heart, at the closure of the auriculo-ventricular valve, described by De Silvestri (11 Medic. Vet., 1871). The embryos of the Filaria immitis are found by the thousands in the blood of the dog, according to Delafond and Gruby. In section, the embryos are t mm. long, and five micromillimeters thick. Lewis found filaria in Indian dogs, buried in the walls of the aorta (The Pathological Significance oj Nematode Hamlatozoa, 18 74). These are usually classed as filaria, and they don't seem to excite any disease when in moderate numbers. In other cases, apoplexy may result from embolism of the heart and closure of the valves; and also the embryos appear to cause apoplexy by blocking up the capillaries of the brain. Besides this they m~y cause epileptiform convulsions and anremia and wasting; also hremorrhages into the lungs and skin, and varied symptoms. Investigation seems useless until the life-history of the filaria is established. Transference of the filaria seems possible by simple contact, but this is so far somewhat doubtful. The embryos of these worms seem to be as easily derivable from outside the body as by contact. S ome interesting papers may be consulted on this subject by Rivolta (Giomale di Pisa, 1877), Lange (Deutsche Zeitscllr.jttr Tlu'ermedicill u. Vergl. Pat/wlogie, 1882), and others. The remarkable tendency of the blood to harbour parasites has been a matter of not recent observation. Their characteristic features manifest a disposition to augment in numbers, under any shock or depression of the system. Sometimes, prolonged exposure to malarious and ill.,.sanitary influence, debilitating eftects from impaired nutrition, from hyperpyrexia, etc., issues in a morbid alteration of the blood peculiarly fitted for the growth and multiplication of these organisms; but, even when no change in the surroundings of the animal is discoverable, a deep impression is often stamped upon the system, leading to their increase.
9
PARASITES IN NORMAL BLOOD. BY RICHARD W. BURKE, V.S., A.V.D., STATION VETERINARY HOSPITAL, CAWNPORE.
LEIDY, in 1858, in Philadelphia, described the Filaria immitis identical with the Filaria papillosa hrematica described by Delafond and Gruby (R ecueil de MCd. :Y ct., 1843, 1844, 1851). The fullgrown filaria, according to Krabbe (Repertor, 1871), reaches a length of IS to 30 em., and a thickness of one mm. Oreste (Gaz . ll1edic. Vet., 1874) found twenty-five examples in the right ventricle of the heart, which seemed to cause embolism and thrombosis described by Serres (Journal du Midi, 1854). In the left side of the heart, at the closure of the auriculo-ventricular valve, described by De Silvestri (11 Medic. Vet., 1871). The embryos of the Filaria immitis are found by the thousands in the blood of the dog, according to Delafond and Gruby. In section, the embryos are t mm. long, and five micromillimeters thick. Lewis found filaria in Indian dogs, buried in the walls of the aorta (The Pathological Significance oj Nematode Hamlatozoa, 18 74). These are usually classed as filaria, and they don't seem to excite any disease when in moderate numbers. In other cases, apoplexy may result from embolism of the heart and closure of the valves; and also the embryos appear to cause apoplexy by blocking up the capillaries of the brain. Besides this they m~y cause epileptiform convulsions and anremia and wasting; also hremorrhages into the lungs and skin, and varied symptoms. Investigation seems useless until the life-history of the filaria is established. Transference of the filaria seems possible by simple contact, but this is so far somewhat doubtful. The embryos of these worms seem to be as easily derivable from outside the body as by contact. S ome interesting papers may be consulted on this subject by Rivolta (Giomale di Pisa, 1877), Lange (Deutsche Zeitscllr.jttr Tlu'ermedicill u. Vergl. Pat/wlogie, 1882), and others. The remarkable tendency of the blood to harbour parasites has been a matter of not recent observation. Their characteristic features manifest a disposition to augment in numbers, under any shock or depression of the system. Sometimes, prolonged exposure to malarious and ill.,.sanitary influence, debilitating eftects from impaired nutrition, from hyperpyrexia, etc., issues in a morbid alteration of the blood peculiarly fitted for the growth and multiplication of these organisms; but, even when no change in the surroundings of the animal is discoverable, a deep impression is often stamped upon the system, leading to their increase.