Which clinical signs are most consistent with highly pathogenic avian influenza in chickens and turkeys?

Which clinical signs are most consistent with highly pathogenic avian influenza in chickens and turkeys?

• A. Loss of color in the eyes, comb and wattle
• B. Neurologic and respiratory signs and decreased egg production
• C. Matting and loss of feathers
• D. Difficulty chewing and swallowing, flaccid paralysis of the neck muscles and generalized weakness accompanied by weight loss

Answer: (B)

Highly pathogenic avian influenza in chickens and turkeys typically presents as an acute, multi-system illness with both neurologic and respiratory involvement and a notable drop in egg production. The combination of neurologic signs (such as ataxia, tremors, and neck twisting) with respiratory signs (nasal discharge, coughing, labored breathing) reflects the virus’s impact on the brain and respiratory tract, while the decreased egg production shows disruption of the birds’ reproductive performance during systemic infection. This trio of signs—neuro involvement, respiratory distress, and production loss—is the most characteristic cluster for HPAI in these poultry species. Other patterns like changes in eye, comb, or wattle coloration, feather matting, or isolated choking or neck weakness without the broader respiratory and production effects are less specific to HPAI and thus less consistent with its typical presentation.

Highly pathogenic avian influenza in chickens and turkeys typically presents as an acute, multi-system illness with both neurologic and respiratory involvement and a notable drop in egg production. The combination of neurologic signs (such as ataxia, tremors, and neck twisting) with respiratory signs (nasal discharge, coughing, labored breathing) reflects the virus’s impact on the brain and respiratory tract, while the decreased egg production shows disruption of the birds’ reproductive performance during systemic infection. This trio of signs—neuro involvement, respiratory distress, and production loss—is the most characteristic cluster for HPAI in these poultry species.

Other patterns like changes in eye, comb, or wattle coloration, feather matting, or isolated choking or neck weakness without the broader respiratory and production effects are less specific to HPAI and thus less consistent with its typical presentation.