CD83 and infection: Furthermore, the rH9HA-CD83 scFv vaccinated chickens had significantly lower average viral load compared to rH9HA vaccinated chickens on day 2 post infection (rH9HA-CD83 scFv: 1220 pfu/ml, rH9HA: 3052 pfu/ml) and day 3 post infection (rH9HA-CD83 scFv: 390 pfu/ml, rH9HA: 1257 pfu/ml).