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Infectious disease · Updated 2026-10-03

Psittacosis (chlamydiosis) in birds

A bacterial infection of parrots and other birds that can also infect people.

Prompt veterinary attentionBirds
Veterinary care setting for birds

Visual guide to warning signs including breathing difficulty, appetite loss, vomiting, mobility change, abnormal droppings and collapse
Changes in breathing, appetite, movement, digestion or alertness can need veterinary assessment. Collapse and breathing difficulty are emergencies.

Signs to watch for

  • Fluffed feathers
  • Eye or nasal discharge
  • Green droppings
  • Breathing difficulty
  • Weight loss

Causes and risk factors

Chlamydia psittaci, spread through droppings and feather dust; birds can carry it without signs.

How veterinarians diagnose it

PCR and blood tests by an avian vet.

Treatment and management

Long courses of antibiotics with hygiene measures.

Prevention

Quarantine new birds, buy from tested sources, clean cages well.

Outlook

Good with treatment.

Common questions

What are the signs of psittacosis (chlamydiosis) in birds?
Fluffed feathers; Eye or nasal discharge; Green droppings; Breathing difficulty; Weight loss.
What causes psittacosis (chlamydiosis) in birds?
Chlamydia psittaci, spread through droppings and feather dust; birds can carry it without signs.
How is psittacosis (chlamydiosis) in birds diagnosed?
PCR and blood tests by an avian vet.
How is psittacosis (chlamydiosis) in birds treated?
Long courses of antibiotics with hygiene measures.
Can psittacosis (chlamydiosis) in birds be prevented?
Quarantine new birds, buy from tested sources, clean cages well.
When should I contact a veterinarian?
Tell your doctor you keep birds if you develop flu-like illness.