Progression of Erythrocytic Inclusion Boby Syndrome in Artificially Infected Coho Salmon
1992 Volume 27 Issue 2 Pages 89-95
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1992 Volume 27 Issue 2 Pages 89-95
Erythrocytic inclusion body syndrome (EIBS) is a major contributor to mortality of coho salmon reared in seawater net-pen culture in Japan. In this paper, a study of disease progression after artificial infection was carried out to better understand the disease and its causative agent.
The five stages described by Piacentini et al. were recognized. Stage II and III were divided into two substages, respectively. A substage (Stage II-a) in which inclusions appeared only in immature erythrocytes was characterized. Stage III which was characterized by appearence of lysed erythrocytes was divided into two substages; Stage III-a (18-21 days postinjection), during which the prevalence of inclusions in mature erythrocytes increased rapidly and incidence of immature erythrocytes decreased rapidly, and Stage III-b (by 24 days postinjection), when the Ht values were lowest and no inclusions were observed in erythrocytes.
Our result showed that a viral agent which causes high mortality in sea-cultured coho salmon in Japan has the same characteristic disease progression as the EIBS virus of North America.
