Clinical Signs

Clinical signs are dependent on the pathogenicity of the infecting virus and the species infected .

In outbreaks of Highly Pathogenic Avian Influenza (HPAI) mortality can be up to 100%. Low Pathogenic Avian Influenza (LPAI) in chickens may even go unnoticed.

Infected ducks may show no clinical symptoms. Turkeys infected with LPAI may show severe clinical signs such as those seen with HPAI infection in chickens.

Symptoms of  HPAI in chickens

• depression
• decreased appetite
• decreased egg production
• nervous signs
• swollen blue combs and wattles
• coughing
• sneezing
• diarrhea
• sudden death 

Symptoms of LPAI in chickens

• mild respiratory disease
• depression
• decreased egg production 

Chickens infected with LPAI and other viruses may show severe clinical signs. Read more