Figure 7
Photomicrographs of Methyl Green-stained lung sections of chickens on day 3 post-H9N2 challenge. Chickens (N = 10) were vaccinated with JOL2068, JOL2074 or JOL2074 + JOL2076, and 28 days later all the vaccinated chickens were challenged with 105 TCID50 H9N2 virus. At 3rd day post-challenge, chickens (n = 3) were sacrificed and lung tissues were collected for immunohistochemistry analysis. The experiment was repeated twice and the results are shown of one independent experiment. Brown dots indicated by arrows represent H9N2 virus particles.