Chlamydophila psittaci is a type of bacteria that primarily infects birds, especially parrots and pigeons. It can cause a disease known as psittacosis, which can be transmitted to humans through contact with infected birds or their droppings. Symptoms in birds may include respiratory issues, lethargy, and changes in behavior. In humans, infection can lead to flu-like symptoms, including fever, chills, and cough. If left untreated, it can result in more severe respiratory problems. Treatment typically involves antibiotics, and prevention includes proper hygiene and care when handling birds.