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Sequential development of the immune response in rainbow trout oncorhynchus mykiss walbaum 1792 to experimental plerocercoid infections of diphyllobothrium dendriticum nitzsch 1824



Sequential development of the immune response in rainbow trout oncorhynchus mykiss walbaum 1792 to experimental plerocercoid infections of diphyllobothrium dendriticum nitzsch 1824



Parasitology 104(1): 169-178



Development of the inflammatory response of rainbow trout to experimental infections with Diphyllobothrium dendriticum pleroceroids is described using light and electron microscopy. The cellular response to pleroceroids occurred within 2 weeks post-infection (p.i.). This was followed by an increase in leucocyte numbers during weeks 3-6 p.i., with full encapsulation plerocercoids by week 6 p.i. Neutrophils were the first leucocytes to enagage the developing plerocercoid, followed by large influxes of macrophages which transformed into epitheloid cells. With longer times p.i. the accumulation of different leucocyte types increased, and a blood vascular network developed. Full development of the composite cyst was characerized by fibroplasia, particularly at the periphery of the cyst, and the subsequent deposition of a collagenous tissue matrix. Enzyme-linked immunosorbent assay (ELISA) examination of serum samples teken over the 20 week period showed that specific anti-D. dendriticum antibody titres were first detected at 5 weeks p.i. and increased to the maximum by 11 weeks p.i.

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Accession: 007783050

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DOI: 10.1017/s0031182000060911


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