Parrot disease, ornithosis, and chlamydiosis are other names for the rare disease of psittacosis. Psittacosis is a bacterial zoonosis in humans caused by the pathogen Chlamydia psittaci. The disease is transmitted from infected birds such as parrots, macaws, parakeets, or turkeys to humans through inhalation of dried secretions. Consequently, bird owners, pet shop employees, and veterinarians are more frequently at risk. Most infections are associated with mild, non-specific flu-like symptoms. In some cases, a more severe pneumonia may occur.