Special report on diseases of the horse / by Drs. Pearson [and others].

Date:
1903
Catalogue details

Licence: In copyright

Credit: Special report on diseases of the horse / by Drs. Pearson [and others]. Source: Wellcome Collection.

    530/690 (page 452)
    more thorough, as the Psoroptes will survive twenty to thirty days in the moist atmosphere of a stable, and may even revive after six or eight weeks when subjected to moist warmth. Infested pastures will therefore prove dangerous to horses for that length of time, and, with rubbing posts, etc., should be secluded. Parasite: Chorioptes bovis (Symbiotes equi, Dermatophagus equi, Chorioptes spatfiiferus). Malady: Foot mange.—This acarus attacks the heels and lower parts of the legs, especially the hind ones, and may be present for years without extending upon the body. Like the Psoroptes, it lives on the surface, on the hairs, and among the scabs. It gives rise to great itching, stamping, rubbing of the one leg with the other, and the formation of papules, wounds, ulcerous sores, and scabs. The intense itching will always suggest this parasite, and the discovery of the acarus will identify the disease. The treatment is the same as for the Sarcoptes, but may be confined to the legs and the parts with which they come in contact. Parasite: Dermanyssus gallinde, or chicken acari. Malady: Poultry acariasis.—This is a large-sized acarus, though usually mis- called “hen louse,”and the disease “poultry-lousiness.” The mite lives in the hen manure and adjacent woodwork, but temporarily passes on to the skin of man and of the horse and other quadrupeds, when occasion serves. It causes much irritation, with the eruption of papules or vesicles and the formation of sores and scabs. The examination of the skin is usually fruitless, as the attacks are mostly made at night and the effects only may be seen during the day. The proximity of hen manure swarming with the acari explains the trouble, and the removal of this and a whitewashing with quicklime, with or without chloride of lime, will prevent future attacks. The skin may still require bland ointments or lotions, as for congestion. Parasite: Larva of a Trombidium, Leptus americanus, or harvest bug, misnamed jigger (chigoe). Malady: Autumn mange.—This para- site is a brick-red acarus, visible to the naked eye on a dark ground, and living on green vegetation in many localities. It attacks man, and the horse, ox, dog, etc., burrowing under the skin and giving rise to small papules and intolerable irritation. This continues for two or three daj^s only if no fresh acari are received, but will last until cold weather sets in if a fresh colony is received every day. Horses at pasture suffer mainly on the lower part of the face. If kept indoors the disease will disappear, or if left at pasture a weak tar-water or solution of tobacco may be applied to the face. Parasites: Gamarus pteroptoides and Cheyletus live in musty fod- ders and are found on the horse. TICKS. The wood ticks are familiar to inhabitants of uncultivated lands, and prove troublesome parasites to man and beast alike. The tick lives on