H9N2 avian influenza virus or bird flu: Causes, symptoms and preventive measures

In poultry, H9N2 infections can range from asymptomatic to severe, depending on various factors such as the bird species, age, and the presence of other pathogens. Common symptoms in birds include respiratory distress, reduced egg production, and a drop in feed consumption. In humans, symptoms are similar to those of other influenza viruses and may include fever, cough, sore throat, and difficulty breathing.