What disease is caused by the bacterium Chlamydiaphila psittaci?

Chlamydiaphila psittaci is the causative agent of psittacosis, which primarily affects birds but can also be transmitted to humans, often through contact with infected birds or their droppings. In humans, the disease manifests as a flu-like illness, sometimes leading to severe respiratory symptoms, pneumonia, and other systemic effects if left untreated. It is particularly associated with pet birds, such as parrots, but can also be contracted from wild birds.

The other options represent diseases caused by different organisms or viral pathogens. Bird flu is caused by influenza viruses, salmonella poisoning is due to Salmonella bacteria typically transmitted via contaminated food or water, and tuberculosis is primarily caused by Mycobacterium tuberculosis. Each of these diseases has distinct etiologies and modes of transmission, underscoring the specificity of Chlamydiaphila psittaci to psittacosis.