Oesophagostomiasis
2019
Miyoshi, M. (The Yamaguchi Veterinary Medical Association, Hikari (Japan))
Oesophagostomum are parasitic nematodes which live in intestinal lumen of sheep, goats, cattle, swine, primate. These nematodes are distributed widely throught the world. Infectious larvae exist outside a field. They are ingested to host with feed or water. In intestinal lumen, they cast sheath, and go into mucosae. On this occasion, nodules are formed. They molt in nodules, and then return to lumen. They molt again and reach maturity. Oesophagostomiasis caused by nodules. In the past, severe damages were occurred in livestock and reported. Recently, improvement of breeding management and progress of anthelmintics, they were few reported. However, if appropriate measures do not perform, damages occur likely. In this report, I given outline pathology views of outdoors infection, which based on past reports in Japan. In sheep, goats, cattle : granuloma and abscess-formed nodule lesion with many eosinophils. There were few larvae in nodules, and few adult worms in lumen. In swine : granuloma, abscess and ulcer-formed nodule lesion with many eosinophils. There were few larvae in nodules, and few adult worms in lumen. In Mmacaca fuscata fuscata : granuloma and abscess-formed lesion with some eosinophils. There were many larvae in nodules, and many adult worms in lumen. Pathological views in each animals were different. They were characterized by structure of nodules and parasitic situation.
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