Chlamydia (also Chlamydophila) psittaci is a Gram-negative, aerobic, spherical bacterium. It belongs to the Chlamydiaceae family.
Chlamydia psittaci causes psittacosis or ornithosis in birds. The pathogen reaches the human lung by inhalation and often triggers atypical pneumonia there.
Transmission mainly occurs via droplets or particles in the air.
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