Relative expression for family A2 by real time PCR of five selected oyster genes. (MyD88: myeloid differentiation factor 88, IkB2: Inhibitor of nuclear factor kappaB kinase beta, IFI44: Interferon induced protein 44, Gly: Glypican and IAP: Inhibitor of apoptosis) at 10, 26, 72 and 144 hpi. White boxplots: non-infected oysters; grey boxplots: infected oysters. Expression levels were normalized to EF (mean ± SD, n = 6). Controls are arbitrarily assigned to a value of 1. *Significant difference of gene expression compared to controls by Mann–Whitney test.