Detection of CD8α+ (A-C) and KUL01+ (D-E) cells in lung 16-24 h after AIV infection. In LPAI infected chickens influxes of CD8α+ cells are mainly detected in and adjacent to the intrapulmonary bronchus (A) and rarely in peripheral parabronchi (B). In HPAI infected chickens influxes of CD8α+ are also detected in peripheral parabronchi (C). Influxes of KUL01+ cells were localised in and adjacent to the intrapulmonary bronchus after infection with LPAI (D), whereas KUL01+ cells are detected in peripheral parabronchi after infection with HPAI (E). These cellular influxes co-localised with virus infected cells.