Would petechial hemorrhages in fat and tracheitis be consistent findings for highly pathogenic avian influenza during necropsy?

• A. Yes
• B. No
• C. Not a typical finding
• D. Only if accompanied by enteric lesions

Answer: (A)

The main idea here is that highly pathogenic avian influenza often causes widespread disease with damage to blood vessels and the respiratory tract. This systemic vascular injury can lead to small pinpoint hemorrhages, including in fat tissue, known as petechiae, and the virus also heavily affects the airways, producing tracheitis. So finding petechial hemorrhages in fat together with tracheitis at necropsy fits the typical, multifocal pattern you’d expect from a highly pathogenic strain. These lesions reflect both the vascular pathology and the strong respiratory tract involvement that characterize HPAI. While other conditions can sometimes cause similar signs, together these findings are consistent with HPAI rather than being exclusive to it or dependent on enteric lesions alone.