Publisher's Synopsis
Excerpt from Blackhead in Chickens and Its Experimental Production by Feeding Embryonated Eggs of Heterakis Papillosa
No. 280, killed 11 days after feeding, presented the same lesions. Neither this nor the preceding bird had shown evidences of disease. The core in the cecum was like that of No. 279. The wall presented certain differences, however. The epithelium and the tubules were normal and intact. The submucosa was markedly edematous and the lymphoid tissue somewhat increased. The blackhead parasite had permeated quite generally and distended the intertubular tissue of the mucosa and had penetrated into the submucosa in large numbers. Worms were seen in the mucosa and the lumen. The cell foci as described under No. 279 were present in the liver of this case.
Chicken 281 was killed 14 days after feeding ova. It had not shown signs of illness. The contents of one cecum were normal and contained larval worms. The wall was possibly slightly thickened and the mucosa sprinkled with minute hemorrhages. Sections of the other cecum showed conditions differing both from the preceding and the following case. The contents were normal. A small por tion of the wall was normal, the rest thickened. The tubules and surface epi thelium were intact. One larval worm was found partly embedded in a tubule. The increased thickness of the wall was due chie?y to a great increase in lymphoid cell groups in the submucosa. In the mucosa there was a slight diffuse infiltra tion of plasma cells. The muscular coat was not involved. Amoeba meleagridis occurred in groups of two to six or more individuals in tissue spaces. The para sites were relatively scarce as compared with No. 279. The liver contained min ute collections of lymphoid cells, from one to two in a field of the 16 mm. Objective.
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