👉 Lambdavirus is a virus that causes a common respiratory illness in poultry, usually caused by the bacteria Listeria monocytogenes. It typically affects birds of all breeds and can be transmitted from infected birds to healthy ones through contaminated feed or water. Symptoms may include fever, cough, lethargy, and diarrhea. Lambdaviruses are classified as Group 1 viruses due to their similarity to other group 1 viruses. Treatment involves antibiotics and supportive care to manage symptoms and