Figure 6

Protection efficacy according to the viremia against challenge with REV and IFA of viremia in CEF cells for the chickens in different groups at the second week after being challenged. A Chickens were challenged with 10⁴ TCID₅₀ of REV HLJR0901 at 4 weeks post immunization and viremia was detected at 7 days post challenge. The viral load of REV challenge group was significantly higher (**p < 0.01) than the recombinant gp90 protein vaccinated and the infection control group. B Mock: negative control; REV: positive control (cell supernatant containing REV); IM-REV+ : plasma samples from the challenged chickens in the control group; IM+ REV+ : plasma samples from the challenged chickens in the recombinant gp90 group; IM-REV−: plasma samples from SPF chickens.