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"In this publication, we study the genetic diversity of the Ostreid herpesvirus 1 (OsHV-1), the causative agent of the Pacific Oyster Mortality Syndrome (POMS), in the three main French oyster-farming areas. Combining quantification of major and minor genetic variations, phylogenetic analysis and ancestral state reconstruction; we assessed the connectivity of OsHV-1 viral populations between the three farming areas. Our results suggest that the Marennes-Oléron Bay represents the main source of OsHV-1 diversity, from where the virus has dispersed to other French farming areas."

Results suggest that the Marennes-Oleron Bay represents the main source of OsHV-1 diversity, from where the virus has dispersed to other farming ́ areas, a scenario consistent with current practices of oyster transfers in France. We demonstrate that phylodynamic approaches can be applied to aquatic DNA viruses to determine how epidemiological, immunological, and evolutionary processes act and potentially interact to shape their diversity patterns.