CD40LG and infection: The IgM binding to LM-PRVσ1-coated beads was low in naïve fish, whereas MFI levels above 20,000 was obtained from week 10 after infection (Figure 5B) Only low levels (MFI up to 426) of antibodies binding to LM-WSSV-ICP11 beads were detected (Figure 5B).