Experimental Infection of Dogs with Avian-Origin Canine Influenza A Virus (H3N2)
Figure 1. Histopathologic appearance of tissue of dogs experimentally exposed to canine influenza virus by contact with infected dogs. Severe necrotizing, suppurative tracheitis and bronchioalveolitis were observed in the contact-exposure group on day postinoculation (dpi) 13. However, influenza-associated lesions were not yet present in these dogs on dpi 7. Original magnification was ×200 for all images. Hematoxylin and eosin stain.