Oyster herpesvirus disease outbreak in Humber

Posted on 1st September 2025

Oyster herpesvirus (OsHV-1 µvar) disease outbreak confirmed in Alexandra Dock, Port of Grimsby, Humber Estuary

Following a report from the Environment Agency of mortalities in a wild population of Pacific oysters (Magallana [syn. Crassostrea] gigas) at Alexandra Dock in the Port of Grimsby, Humber Estuary, a Fish Health Inspector from the Centre for Environment, Fisheries and Aquaculture Science (Cefas) visited the affected site to inspect the oysters and collect samples for analysis at Cefas National Reference Laboratory for molluscan diseases.

Samples taken from the affected population were confirmed as positive for oyster herpesvirus-1 microvariant (OsHV-1 µvar), and a new containment area covering the tidal waters of the Humber Estuary has been declared.

More information can be found at Oyster herpesvirus disease outbreak confirmed in Humber Estuary - GOV.UK.

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