From: Highly pathogenic or low pathogenic avian influenza virus subtype H7N1 infection in chicken lungs: small differences in general acute responses
Tissue
Cranial (hpi)
Caudal (hpi)
4
8
16
24
Lung
LPAI
1
0
5
0*
3
HPAI
6
1*
Trachea
2*
5*
Airsac
2
1**
0**