Emergence and clonal expansion of <i>Vibrio aestuarianus</i> lineages pathogenic for oysters in Europe

Mesnil, Aurélie; Jacquot, Maude; Garcia, Céline; Tourbiez, Delphine; Canier, Lydie; Bidois, Audrey; Dégremont, Lionel; Cheslett, Deborah; Geary, Michelle; Vetri, Alessia; Roque, Ana; Furones, Dolors; Garden, Alison; Orozova, Petya; Arzul, Isabelle; Sicard, Mathieu; Charrière, Guillaume M.; Destoumieux-Garzón, Delphine; Travers, Marie-Agnès

doi:10.1111/mec.16910

Cited by 4 publications

(6 citation statements)

References 83 publications

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“…Pacific oyster summer mortality events in Ireland are shown here to be associated with two V. aestuarianus clades and a variety of strains within the V. splendidus complex. Notably, the two V. aestuarianus clades in Ireland have been described elsewhere in Europe, as clade A and B [23,45]. Novel lineages were not detected, which underscores the importance of these two clades in Pacific oyster summer mortalities.…”

Section: Perspectivesmentioning

confidence: 76%

“…Notably, the two V. aestuarianus clades in Ireland have been described elsewhere in Europe, as clade A and B [23, 45]. Novel lineages were not detected, which underscores the importance of these two clades in Pacific oyster summer mortalities.…”

Section: Discussionmentioning

confidence: 97%

“…A recent study involving the sequencing of V. aestuarianus strains across Europe showed that these two oyster-associated clades have now been found in multiple countries within Europe [ 45 ]. Their findings suggest that the emergence of these clades is the result of adaptation to a new environmental niche within which they have become oyster-specialist pathogens.…”

Section: Discussionmentioning

confidence: 99%

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Vibrio aestuarianus clade A and clade B isolates are associated with Pacific oyster (Magallana gigas) disease outbreaks across Ireland

et al. 2023

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Bacteria from the family Vibrionaceae have been implicated in mass mortalities of farmed Pacific oysters (Magallana gigas) in multiple countries, leading to substantial impairment of growth in the sector. In Ireland there has been concern that Vibrio have been involved in serious summer outbreaks. There is evidence that Vibrio aestuarianus is increasingly becoming the main pathogen of concern for the Pacific oyster industry in Ireland. While bacteria belonging to the Vibrio splendidus clade are also detected frequently in mortality episodes, their role in the outbreaks of summer mortality is not well understood. To identify and characterize strains involved in these outbreaks, 43 Vibrio isolates were recovered from Pacific oyster summer mass mortality episodes in Ireland from 2008 to 2015 and these were whole-genome sequenced. Among these, 25 were found to be V. aestuarianus (implicated in disease) and 18 were members of the V. splendidus species complex (role in disease undetermined). Two distinct clades of V. aestuarianus – clade A and clade B – were found that had previously been described as circulating within French oyster culture. The high degree of similarity between the Irish and French V. aestuarianus isolates points to translocation of the pathogen between Europe’s two major oyster-producing countries, probably via trade in spat and other age classes. V. splendidus isolates were more diverse, but the data reveal a single clone of this species that has spread across oyster farms in Ireland. This underscores that Vibrio could be transmitted readily across oyster farms. The presence of V. aestuarianus clades A and B in not only France but also Ireland adds weight to growing concern that this pathogen is spreading and impacting Pacific oyster production within Europe.

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Section: Perspectivesmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Vibrio aestuarianus clade A and clade B isolates are associated with Pacific oyster (Magallana gigas) disease outbreaks across Ireland

et al. 2023

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“…Pacific oyster summer mortality events in Ireland are shown here to be associated with two V. aestuarianus clades and a variety of strains within the V. splendidus complex. Notably, the two V. aestuarianus clades in Ireland have been described elsewhere in Europe, as Clade A and B [11,38]. Novel lineages where not detected which underscores the importance of these two clades in Pacific oyster summer mortalities.…”

Section: Perspectivesmentioning

confidence: 80%

“…A recent study involving the sequencing of V. aestuarianus strains across Europe showed that these two oyster-associated clades have now been found in multiple countries within Europe [38]. The authors found low genomic diversity within each clade and suggested that their emergence may have been the result of adaptation to oyster pathogenicity.…”

Section: Two V Aestuarianus Clades Linked With Oyster Mortalities In ...mentioning

confidence: 99%

Vibrio aestuarianusClade A and Clade B isolates are associated with Pacific oyster (Crassostrea gigas) disease outbreaks across Ireland

Coyle¹,

O'Toole²,

Thomas³

et al. 2023

Preprint

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Bacteria from the Vibrionaceae family have been implicated in mass mortalities of farmed Pacific oysters (Crassostrea gigas) in multiple countries, leading to substantial impairment for growth in the sector. In Ireland there has been concern thatVibriohave been involved in serious summer outbreaks. There is evidence thatVibrio aestuarianusis increasingly becoming the main pathogen of concern for the Pacific Oyster industry in Ireland. While bacteria belonging to theVibrio splendidusclade are also detected frequently in mortality episodes, their role in the outbreaks of summer mortality are not well understood. To identify and characterise strains involved in these outbreaks, 43Vibrioisolates were recovered from Pacific oyster summer mass mortality episodes in Ireland from 2008-2015 and these were whole genome sequenced. Among these, 25 were found to beV. aestuarianus(implicated in disease) and 18V. splendidus sensu lato(role in disease undetermined). Two distinct clades ofV. aestuarianus— Clade A and Clade B — were found that had previously been described as circulating within French oyster culture. The high degree of similarity between the Irish and FrenchV. aestuarianusisolates points to translocation of the pathogen between Europe's two major oyster producing countries, probably via trade in spat and other age classes.V. splendidusisolates were more diverse, but the data reveal a single clone of this species that has spread across oyster farms in Ireland. This underscores thatVibriocould be transmitted readily across oyster farms. The presence ofV. aestuarianusClades A and B in not only France but also Ireland adds weight to the growing concern that this pathogen is spreading and impacting Pacific oyster production within Europe.

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Investigations of the involvement of Vibrio species with Ostreid herpesvirus-1 in mass mortality events in the Pacific oyster Crassostrea gigas

Whittington,

Buller,

Pathirana

et al. 2024

Aquaculture

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Emergence and clonal expansion of Vibrio aestuarianus lineages pathogenic for oysters in Europe

Cited by 4 publications

References 83 publications

Vibrio aestuarianus clade A and clade B isolates are associated with Pacific oyster (Magallana gigas) disease outbreaks across Ireland

Vibrio aestuarianus clade A and clade B isolates are associated with Pacific oyster (Magallana gigas) disease outbreaks across Ireland

Vibrio aestuarianusClade A and Clade B isolates are associated with Pacific oyster (Crassostrea gigas) disease outbreaks across Ireland

Investigations of the involvement of Vibrio species with Ostreid herpesvirus-1 in mass mortality events in the Pacific oyster Crassostrea gigas

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