Detection of the OsHV-1 μVar in the Pacific oyster Crassostrea gigas before 2008 in France and description of two new microvariants of the Ostreid Herpesvirus 1 (OsHV-1)

► Two hundred and six samples of Crassostrea gigas were analyzed for the detection of variants of the Ostreid Herpesvirus 1. ► First report of the detection of the Ostreid Herpesvirus 1 μVar before 2008 in France.► The Ostreid Herpesvirus 1 μVar was often detected.► Two new variants were described.