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Provedor de dados:  ArchiMer
País:  France
Título:  Crassostrea gigas mortality in France: the usual suspect, a herpes virus, may not be the killer in this polymicrobial opportunistic disease
Autores:  Petton, Bruno
Bruto, Maxime
James, Adele
Labreuche, Yannick
Alunno-bruscia, Marianne
Le Roux, Frederique
Data:  2015-07
Ano:  2015
Palavras-chave:  Pacific oysters
Summer mortality
Herpes virus
Vibrio pathogenicity
Experimental infection
Resumo:  Successive disease outbreaks in oyster (Crassostrea gigas) beds in France have resulted in dramatic losses in production, and subsequent decline in the oyster-farming industry. Deaths of juvenile oysters have been associated with the presence of a herpes virus (OsHV-1 µvar) and bacterial populations of the genus Vibrio. Although the pathogenicity of OsHV-1 µvar, as well as several strains of Vibrio has been demonstrated by experimental infections, our understanding of the complexity of infections occurring in the natural environment remains limited. In the present study, we use specific-pathogen-free (SPF) oysters infected in an estuarine environment to study the diversity and dynamics of cultured microbial populations during disease expression. We observe that rapid Vibrio colonization followed by viral replication precedes oyster death. No correlation was found between the vibrio concentration and viral load in co-infected animals. We show that the quantity of viral DNA is a predictor of mortality, however, in the absence of bacteria, a high load of herpes virus is not sufficient to induce the full expression of the disease. In addition, we demonstrate that juvenile mortalities can occur in the absence of herpes virus, indicating that the herpes virus appears neither essential nor sufficient to cause juvenile deaths; whereas bacteria are necessary for the disease. Finally, we demonstrate that oysters are a reservoir of putative pathogens, and that the geographic origin, age, and cultivation method of oysters influence disease expression.
Tipo:  Text
Idioma:  Inglês

Editor:  Frontiers Research Foundation
Formato:  application/pdf
Fonte:  Frontiers In Microbiology (1664-302X) (Frontiers Research Foundation), 2015-07 , Vol. 6 , P. -
Direitos:  2015 Petton, Bruto, James, Labreuche, Alunno_bruscia and Le_roux. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms


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