Psittacosis in Parrots: Symptoms, Treatment, and the Human Health Risk
Psittacosis — also called parrot fever or chlamydiosis — is a bacterial infection that affects parrots, cockatiels, budgies, and many other bird species. In 2026, it's one of the most important diseases for bird owners to know about, both because it can seriously harm birds and because it's zoonotic — it can spread from birds to people.
What Is Psittacosis?
Psittacosis is caused by Chlamydia psittaci (previously classified as Chlamydophila psittaci), an intracellular bacterium. It's carried by a wide range of bird species and can be shed in droppings, nasal secretions, and feather dust — even by birds that appear healthy.
Stress commonly triggers active shedding. A bird that was a silent carrier can begin shedding the bacteria and showing symptoms after shipping, rehoming, illness, or other stressors. This is why newly acquired birds from pet stores or bird fairs may test positive or become symptomatic shortly after arriving in a new home.
Symptoms of Psittacosis in Parrots and Birds
Psittacosis can present in a wide range of ways — from a mild, chronic illness to a rapidly severe infection. Common signs include:
- Lethargy and fluffed feathers — the bird sits still, feathers puffed up, eyes half-closed
- Loss of appetite — reduced interest in food and treats (see parrot not eating)
- Nasal or ocular discharge — runny eyes, wet nares
- Sneezing — often persistent (see parrot sneezing)
- Lime-green or yellow-green droppings — a distinctive sign; the green color comes from liver involvement
- Diarrhea — loose, abnormal droppings
- Weight loss — bird feels light when held
- Breathing difficulty — open-beak breathing, tail bobbing
- Conjunctivitis — red, swollen eyes
Psittacosis commonly affects the liver, causing the characteristic change in dropping color. Respiratory involvement (essentially pneumonia in birds) can also occur.
The Human Health Risk
Psittacosis is a notifiable zoonotic disease in most US states. Humans can become infected through:
- Inhalation of dried bird droppings or feather dust
- Direct beak-to-mouth contact
- Handling infected birds without hand hygiene
In humans, psittacosis typically causes flu-like illness — fever, headache, muscle aches, and pneumonia. It can be severe in elderly or immunocompromised people. It is treatable with doxycycline in humans.
If you have a bird diagnosed with psittacosis and you develop flu-like symptoms, inform your physician of your bird exposure.
When to Worry
See an avian vet immediately if your parrot:
- Has green or lime-colored droppings for more than a day
- Is lethargic and not eating
- Has difficulty breathing
- Has ocular or nasal discharge alongside lethargy
Do not wait — psittacosis can progress rapidly, and parrot respiratory infections generally require prompt antibiotic treatment.
What to Do at Home (Before Vet Visit)
- Isolate the sick bird from other birds
- Wear gloves and a mask when cleaning the cage — the bacteria is shed in droppings
- Do not allow feather dust exposure to household members who are immunocompromised, pregnant, or elderly
- Disinfect with appropriate agents — quaternary ammonium compounds, dilute bleach (after rinsing)
Treatment
Psittacosis is treated with doxycycline, typically for 30-45 days. This may be given orally or by injection. During treatment, remove calcium supplements (cuttlebone, mineral blocks) as calcium interferes with doxycycline absorption.
All in-contact birds should be tested and may need treatment even if asymptomatic.
How Voyage Can Help
Voyage AI Vet can help you assess whether your parrot's symptoms are consistent with psittacosis or another condition — and guide you on next steps, including how urgently your bird needs to be seen. Starting at $4.99/month.
Frequently Asked Questions
Q: Can I get psittacosis from my parrot? A: Yes. Psittacosis is a zoonotic disease. The risk is real but manageable with good hygiene — wash hands after handling birds, avoid face-to-beak contact, and clean cages regularly.
Q: How is psittacosis diagnosed in birds? A: Your avian vet will likely use a PCR test on a choanal swab or fecal sample. Blood tests and physical examination also help. Testing is important because symptoms overlap with many other bird illnesses.
Q: Can my bird be a carrier without showing symptoms? A: Yes. Many birds carry Chlamydia psittaci latently and shed it intermittently without appearing ill, especially during stress. This is why testing new birds is recommended.
Q: How long is treatment for psittacosis? A: 30-45 days of doxycycline is standard. Shorter courses frequently result in relapse. It's important to complete the full treatment course.
Q: Is psittacosis the same as parrot fever? A: Yes. "Parrot fever" is the common name for psittacosis, referring to its association with psittacine (parrot family) birds. The disease can also be acquired from other bird species including pigeons, doves, and poultry.
This article is for informational purposes only and is not a substitute for professional veterinary advice. For exotic pets, always consult a vet with exotic animal experience.