Temperature modulate disease susceptibility of the Pacific oyster Crassostrea gigas and virulence of the Ostreid herpesvirus type 1

Type Article
Date 2018-09
Language English
Author(s) Delisle Lizenn1, Petton BrunoORCID2, Burguin Jean Francois1, Morga BenjaminORCID3, Corporeau CharlotteORCID1, Pernet FabriceORCID1
Affiliation(s) 1 : IFREMER, LEMAR, UMR 6539, Technopole Brest Iroise, F-29280 Plouzane, France.
2 : IFREMER, LEMAR, UMR 6539, F-29840 Presquile Du Vivier, Argenton, France.
3 : IFREMER, LGPMM, Ave Mus Loup, F-17390 La Tremblade, France.
Source Fish & Shellfish Immunology (1050-4648) (Academic Press Ltd- Elsevier Science Ltd), 2018-09 , Vol. 80 , P. 71-79
DOI 10.1016/j.fsi.2018.05.056
WOS© Times Cited 31
Keyword(s) Bivalve, Health, Marine disease, Mortality risk, Temperature, Virulence

Temperature triggers marine diseases by changing host susceptibility and pathogen virulence. Oyster mortalities associated with the Ostreid herpesvirus type 1 (OsHV-1) have occurred seasonally in Europe when the seawater temperature range reaches 16–24 °C. Here we assess how temperature modulates oyster susceptibility to OsHV-1 and pathogen virulence. Oysters were injected with OsHV-1 suspension incubated at 21 °C, 26 °C and 29 °C and were placed in cohabitation with healthy oysters (recipients) at these three temperatures according to a fractional factorial design. Survival was followed for 14 d and recipients were sampled for OsHV-1 DNA quantification and viral gene expression. The oysters were all subsequently placed at 21 °C to evaluate the potential for virus reactivation, before being transferred to oyster farms to evaluate their long-term susceptibility to the disease. Survival of recipients at 29 °C (86%) was higher than at 21 °C (52%) and 26 °C (43%). High temperature (29 °C) decreased the susceptibility of oysters to OsHV-1 without altering virus infectivity and virulence. At 26 °C, the virulence of OsHV-1 was enhanced. Differences in survival persisted when the recipients were all placed at 21 °C, suggesting that OsHV-1 did not reactivate. Additional oyster mortality followed the field transfer, but the overall survival of oysters infected at 29 °C remained higher.

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Delisle Lizenn, Petton Bruno, Burguin Jean Francois, Morga Benjamin, Corporeau Charlotte, Pernet Fabrice (2018). Temperature modulate disease susceptibility of the Pacific oyster Crassostrea gigas and virulence of the Ostreid herpesvirus type 1. Fish & Shellfish Immunology, 80, 71-79. Publisher's official version : https://doi.org/10.1016/j.fsi.2018.05.056 , Open Access version : https://archimer.ifremer.fr/doc/00442/55337/