Figure 3

The percentage survival of chicks in the 1-day-old groups and gross lesions in the 1-day-old and 28-day-old infected groups. A Survival percentage of 1-day-old SPF chicks inoculated with the CK/CH/GX/202109 strain. B Nephritis in 1-day-old infected groups (7 dpi). C Air-sac lesions in the 1-day-old infected groups (7 dpi). D The proventriculus had a dilated gastric isthmus in the 1-day-old infected groups (14 dpi). E Unconspicuous papilla of the proventriculus and thickening of the wall in the 1-day-old infected groups (14 dpi). F Exfoliation of most of the endothelial corneum in the 1-day-old infected groups (7 dpi). G The tracheal membrane haemorrhage and small amount of mucus in 28-day-old infected groups (7 dpi).