Counting the dead to determine the source and transmission of the marine herpesvirus OsHV-1 in Crassostrea gigas

Marine herpesviruses are responsible for epizootics in economically, ecologically and culturally significant taxa. The recent emergence of microvariants of Ostreid herpesvirus 1 (OsHV-1) in Pacific oysters Crassostrea gigas has resulted in socioeconomic losses in Europe, New Zealand and Australia however, there is no information on their origin or mode of transmission. These factors need to … Continue reading Counting the dead to determine the source and transmission of the marine herpesvirus OsHV-1 in Crassostrea gigas

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Histological alterations in Pacific oysters Crassostrea gigas that survived a summer mortality event in Baja California, Mexico

A mortality episode (>90%) of triploid and diploid Pacific oysters Crassostrea gigas cultured in Baja California Sur occurred during summer 2012, coinciding with a thermal anomaly, an algal bloom, and low oxygen values. To help explain the cause of the mortalities, histological analyses and molecular tests for specific pathogens (ostreid herpesvirus 1 [OsHV‐1] and Perkinsus … Continue reading Histological alterations in Pacific oysters Crassostrea gigas that survived a summer mortality event in Baja California, Mexico

Identification of a newly described OsHV-1 µvar from the North Adriatic Sea (Italy)

The surveillance activities for abnormal bivalve mortality events in Italy include the diagnosis of ostreid herpesvirus type 1 (OsHV-1) in symptomatic oysters. OsHV-1-positive oysters (Crassostrea gigas) were used as a source for in vivo virus propagation and a virus-rich sample was selected to perform shotgun sequencing based on Illumina technology. Starting from this unpurified supernatant … Continue reading Identification of a newly described OsHV-1 µvar from the North Adriatic Sea (Italy)

Antiviral defense and innate immune memory in the oyster

The Pacific oyster, Crassostrea gigas, is becoming a valuable model for investigating antiviral defense in the Lophotrochozoa superphylum. In the past five years, improvements to laboratory-based experimental infection protocols using Ostreid herpesvirus I (OsHV-1) from naturally infected C. gigas combined with next-generation sequencing techniques has revealed that oysters have a complex antiviral response involving the … Continue reading Antiviral defense and innate immune memory in the oyster

Detection and molecular characterization of betanodaviruses retrieved from bivalve molluscs

Betanodaviruses are small ssRNA viruses responsible for viral encephalopathy and retinopathy, otherwise known as viral nervous necrosis, in marine fish worldwide. These viruses can be either horizontally or vertically transmitted and have been sporadically detected in invertebrates, which seem to be one of the possible viral sources. Twenty‐eight new betanodavirus strains were retrieved in three … Continue reading Detection and molecular characterization of betanodaviruses retrieved from bivalve molluscs

Molecular identification and functional analysis of two variants of myeloid differentiation factor 88 (MyD88) from disk abalone (Haliotis discus discus)

Myeloid differentiation factor 88 (MyD88) is a crucial adaptor protein of the Toll-like receptor (TLR)- and interleukin 1 receptor-mediated signaling pathways and is involved in a diverse array of inflammatory responses via NF-κB activation. In the present study, two MyD88 variants were identified from disk abalone (Haliotis discus discus) and designated AbMyD88-2 and AbMyD88-X. The … Continue reading Molecular identification and functional analysis of two variants of myeloid differentiation factor 88 (MyD88) from disk abalone (Haliotis discus discus)

Oyster virus may cause devastating results for Tasmania

Oyster supplies in Tasmania are being threatened by a viral disease, which is concerning to producers ahead of the Christmas period. The concern in the sector stems from the fact that the virus causing Pacific Oyster Mortality Syndrome (POMS), which is harmless to humans, weakens oysters and makes them lose their ability to close their … Continue reading Oyster virus may cause devastating results for Tasmania