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Intestine of pigeon showing (A) multiple roundworms in the lumen, shortening of intestinal villi, and segmental muscular hypertrophy of the tunica musculosa, (B) single roundworm in the lumen of less infested chicken, (C, D) epithelial and goblet cell hyperplasia in the lamina epithelialis, and fibrosis of lamina propria and submucosa with leukocytes infiltration.
