. Common diseases of farm animals. Veterinary medicine. CHAPTER XXXI INFECTIOUS DISEASES OF POULTRY Fowl Cholera.—This is a liiglily infectious disease of all species of poultry, that is characterized by weakness, depression and yellowish colored excrement. The specific cause of fowl cholera is the Bacillus avisepticus (Fig. 123). This microorganism is transmitted to the healthy birds by the feed, or water becoming contaminated with the dis- charges from the diseased birds. According to Salmon, the period of incubating varies from four to twenty days. llie early si/mptojns are a falling off in
. Common diseases of farm animals. Veterinary medicine. CHAPTER XXXI INFECTIOUS DISEASES OF POULTRY Fowl Cholera.—This is a liiglily infectious disease of all species of poultry, that is characterized by weakness, depression and yellowish colored excrement. The specific cause of fowl cholera is the Bacillus avisepticus (Fig. 123). This microorganism is transmitted to the healthy birds by the feed, or water becoming contaminated with the dis- charges from the diseased birds. According to Salmon, the period of incubating varies from four to twenty days. llie early si/mptojns are a falling off in appetite, high fever, dulness, diarrhcca and weakness. The affected bird becomes drowsy, the head is drawn toward the body, and it may remain asleep for long periods at a time. Salmon states that the general outline of the sick bird becomes spheri- cal or ball-shaped. The disease is usually highly fatal. In the acute form the larger portion of the flock mav die off within a week. " _ Fig. 123.—Bacillus aiisepticus. In the subacute and chronic forms, the birds become greatly emaciated, and a few die off weekly through a period of a month or longer. The tissue changes occurring in the disease are inflammation of all or a few of the internal organs. Ward states that the most characteristic lesion of fowl cholera is the severe inflammation of that portion of the small intestine nearest to the gizzard. Small hemorrhagic spots may be found on the heart and other organs. The treatment is J>oth preventive and curative. The pre- ventive treatment consists in quarantining newly purcha:?d 323. 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 Craig, Robert Alexander, 1872-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookpublisherphilad, booksubjectveterinarymedicine, bookyear1919
