There are 3 Chlamydia species that cause disease in humans; although they share a common name, they are not the same. Chlamydia trachomatis is the cause of genital infection and most strains (but not all) are transmitted only by sex. Chlamydia psittaci is the cause of psittacosis; it is carried by birds and can cause pneumonia in people by airborne transmission. It is rare, and never sexually transmitted. No. 3 is Chlamydia pneumoniae, which--as the name suggests--causes pneumonia or other respiratory infections. It is transmitted through the air, not sexually. C. pneumoniae also has been implicated in arteriosclerosis, heart attacks, stroke, etc.
Nobody gets genital chlamydial infection from an infected bird, or from a person with respiratory infection. Sex is the only route of transmission.
I hope that helps. Best wishes-- HHH, MD