Chlamydia psittaci is a type of bacteria that can cause an infection known as psittacosis, primarily affecting birds but also capable of infecting humans. It is often transmitted through inhalation of dust from dried bird droppings or respiratory secretions. Common symptoms in humans include fever, chills, and respiratory issues. In birds, Chlamydia psittaci can lead to severe respiratory illness and can be found in various species, especially parrots. The infection can be serious if left untreated, but it is typically managed with antibiotics in both birds and humans. Early diagnosis and treatment are crucial for recovery.