Universal reverse-transcriptase real-time PCR for infectious hematopoietic necrosis virus (IHNV)

Diseases of Aquatic Organisms
By: , and 



Infectious hematopoietic necrosis virus (IHNV) is an acute pathogen of salmonid fishes in North America, Europe and Asia and is reportable to the World Organization for Animal Health (OIE). Phylogenetic analysis has identified 5 major virus genogroups of IHNV worldwide, designated U, M, L, E and J; multiple subtypes also exist within those genogroups. Here, we report the development and validation of a universal IHNV reverse-transcriptase real-time PCR (RT-rPCR) assay targeting the IHNV nucleocapsid (N) gene. Properties of diagnostic sensitivity (DSe) and specificity (DSp) were defined using laboratory-challenged steelhead trout Oncorhynchus mykiss, and the new assay was compared to the OIE-accepted conventional PCR test and virus isolation in cell culture. The IHNV N gene RT-rPCR had 100% DSp and DSe and a higher estimated diagnostic odds ratio (DOR) than virus culture or conventional PCR. The RT-rPCR assay was highly repeatable within a laboratory and highly reproducible between laboratories. Field testing of the assay was conducted on a random sample of juvenile steelhead collected from a hatchery raceway experiencing an IHN epizootic. The RT-rPCR detected a greater number of positive samples than cell culture and there was 40% agreement between the 2 tests. Overall, the RT-rPCR assay was highly sensitive, specific, repeatable and reproducible and is suitable for use in a diagnostic setting.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Universal reverse-transcriptase real-time PCR for infectious hematopoietic necrosis virus (IHNV)
Series title Diseases of Aquatic Organisms
DOI 10.3354/dao02644
Volume 2
Issue 106
Year Published 2013
Language English
Publisher Inter-Research
Contributing office(s) Western Fisheries Research Center
Description 13 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Diseases of Aquatic Organisms
First page 103
Last page 115
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