Fig. 2

Schematic of the mesocosm (left panel) and field (right panel) protocols of infection. For the experimental infection, pathogen free oysters (mix of the fifteen families) were deployed in the natural environment in a farming area during disease outbreaks and brought back to a controlled environment to transfer the disease to each of the 15 oyster families under controlled conditions. For field infection, each of the 15 oyster families were exposed to an infectious environment during a disease outbreak. Experimental infections were performed with infectious environments from Atlantic and Mediterranean origin