Figure 5

Pro-inflammatory cytokine mRNA expression in the cranial and caudal part of the lung after inoculation with LPAI (white bar) or HPAI (black bar) at different time points post inoculation (hpi). IL-1β, IL-6 and IL-8 mRNA expression was shown as fold induction compared to uninfected birds ± SD. * p < 0.05 between infected and control chickens; line p < 0.05 between the LPAI and HPAI group of a specific time point pi.