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Histologic sections of gills from farmed Atlantic salmon stained with haematoxylin and eosin. (a) Unidentified metazoan between two lamellae with epithelial hyperplasia (arrow). (b) Amoebic gill disease lesion with presence of amoebae (arrows). (c) Epitheliocyst in the base of the lamellae suggestive of Candidatus Clavochlamydia salmonicola (arrow). (d) Epitheliocysts in the distal part of the lamellae suggestive of Candidatus Branchiomonas cysticola (arrows).
