Psittacosis is a lung infection caused by bacteria called Chlamydia psittaci. These bacteria are found mainly in birds, such as parrots, parakeets, pigeons, chickens, ducks, and lovebirds.
Chlamydia psittaci bacteria can infect a number of mammal species. Birds are the major reservoir for the organism and are an important source for human disease. Humans usually get the disease by inhaling the bacteria from dried bird droppings or infected secretions. Symptoms begin 1 to 2 weeks after infection.
Psittacosis is caused by the bacterium Chlamydia psittaci. Someone who lives or works around birds is at risk for getting the disease.