1. Comparative analysis of the course of infection and the immune response in rainbow trout (Oncorhynchus mykiss) infected with the 5 genotypes of infectious hematopoietic necrosis virus.
- Author
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Louboutin, Lénaïg, Cabon, Joëlle, Vigouroux, Estelle, Morin, Thierry, and Danion, Morgane
- Subjects
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INFECTIOUS hematopoietic necrosis virus , *STEELHEAD trout , *RAINBOW trout , *IMMUNE response , *HUMORAL immunity , *GENOTYPES - Abstract
Infectious hematopoietic necrosis virus (IHNV) is a pathogen of importance for salmonid aquaculture. In this study, we aimed to characterize virus behavior and defense mechanisms developed in rainbow trout (RT, Oncorhynchus mykiss) experimentally infected with isolates belonging to the five described genotypes of IHNV, i.e. L, U, M, E and J. Mortality was monitored for two months, and blood and target organs were sampled at different times post-infection to assess viral load and cellular and humoral immune responses. Profiles of virulence were highly linked to precocious viral replication but also to the innate and specific immunity elicited in the host. Seroneutralization test (SNT) used for specific antibodies detection exhibited reliable results, with efficient cross-neutralization observed in heterologous systems except for the Asian representative. These data bring new insights about IHNV/RT interaction and reinforce the interest of SNT as preventive and epidemiological tool. • Innate and specific immunity in rainbow trout are highly connected to strain virulence. • Cross-neutralization was demonstrated between strains belonging to different genotypes. • Cross-neutralization is more marked between strains adapted to a specific host. • Standard SNT targeting IHNV antibodies is a reliable indicator (except Asian strains). [ABSTRACT FROM AUTHOR]
- Published
- 2021
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