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. 2022 Aug 3;11(8):878. doi: 10.3390/pathogens11080878

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Histologic sections of gills from farmed Atlantic salmon stained with haematoxylin and eosin. (a) Moderate multifocal lamellar telangiectasias (arrows). (b) Epithelial necrosis of the lamellar outer margins (arrows). (c) Mild focal lamellar haemorrhages (boxes). (d) Two foci of lamellar tissue disruption and haemorrhage (boxes). (e) Lamellar epithelial hyperplasia and fusion and multifocal lamellar thrombi. (f) Mild multifocal lamellar thrombi with variable hyperplasia of the surrounding epithelium and lamellar shortening (arrows).