Fig. 3: RSV infection of nasal respiratory mucosa.

A, B Within the respiratory mucosa of ferrets (a, nasal turbinates, H&E) and hamsters, (nasal cavity, H&E) a multifocal infiltration of intra-epithelial (grey arrowheads) and submucosal granulocytes (black arrowheads) is present. In the hamster, there are also low to moderate numbers of necrotic single cells (arrows). Multifocal, epithelial cells in the nasal turbinates of ferrets (C) and nasal cavity of hamsters (D) are immunolabeled for RSV antigen (arrow) by chromogenic DAB immunochemistry. Bars, 50 μm.