Reproducibility of mortality on Pacific oyster spat after injection of different infectious OsHV-1 homogenates made from experimentally infected animals. The dash line represent the mortality recorded after injection of the initial homogenate 2, which is made from naturally infected oyster spat collected on the field (South Brittany). The dotted lines corresponds to mortalities recorded in five consecutive transmission assays conducted using five different homogenates made from oyster spat dead previously in experimental conditions. The mean mortality is indicated by the solid line. Results are expressed as the percentage of cumulative mortality (n = 10). Standard deviation is represented by error bars.