Psittacosis (Chlamydiosis) in Cockatiels: Symptoms, Zoonotic Risk, and Treatment
- See your vet immediately if your cockatiel has trouble breathing, severe lethargy, rapid weight loss, or yellow-green droppings with other signs of illness.
- Psittacosis, also called chlamydiosis or parrot fever, is caused by the bacterium Chlamydia psittaci and is more commonly reported in cockatiels and other parrots.
- Some cockatiels carry and shed the organism without looking sick, so a normal-looking bird can still expose other birds and people.
- Human infection usually happens by breathing in contaminated dust from dried droppings or respiratory secretions. Anyone in the home with flu-like illness after bird exposure should contact a physician promptly.
- Treatment usually involves a long course of doxycycline directed by your vet, often for about 45 days, plus isolation, cleaning changes, and supportive care.
What Is Psittacosis (Chlamydiosis) in Cockatiels?
Psittacosis, also called avian chlamydiosis, is an infectious disease caused by the bacterium Chlamydia psittaci. In cockatiels, it can affect the respiratory tract, liver, digestive tract, and other organs. Some birds become clearly ill, while others carry the organism and shed it off and on without obvious symptoms.
Cockatiels are one of the pet bird species more commonly associated with this infection. That matters for two reasons. First, the disease can range from mild to life-threatening in birds. Second, it is zoonotic, which means it can spread from birds to people, usually when contaminated dust from droppings or respiratory secretions is inhaled.
Because signs can be vague at first, psittacosis is easy to miss. A cockatiel may look tired, eat less, lose weight, or develop nasal discharge before more serious breathing problems appear. If your bird seems off in any way, especially with respiratory signs or green-yellow droppings, your vet should guide the next steps.
Symptoms of Psittacosis (Chlamydiosis) in Cockatiels
- Fluffed-up posture and lethargy
- Decreased appetite and weight loss
- Nasal discharge, runny eyes, or sneezing
- Labored breathing or tail bobbing
- Yellow-green droppings or urates
- Diarrhea or loose droppings
- Weakness or sudden decline
Psittacosis does not always look dramatic at first. Some cockatiels show only subtle changes, like eating less, losing weight, or sitting quietly with fluffed feathers. Others may have respiratory signs, digestive upset, or liver-related droppings changes.
See your vet immediately if your cockatiel has open-mouth breathing, tail bobbing, marked weakness, or stops eating. Also take extra care if anyone in the household develops fever, headache, muscle aches, or cough after exposure to a sick bird, because people can become infected too.
What Causes Psittacosis (Chlamydiosis) in Cockatiels?
Psittacosis is caused by infection with Chlamydia psittaci, a bacterium that lives inside the bird's cells. Cockatiels usually become infected by inhaling or ingesting contaminated material from droppings, feather dust, eye or nasal discharge, or respiratory secretions. Close housing, poor ventilation, transport, crowding, and other stressors can increase spread and may trigger shedding in birds that were previously silent carriers.
One challenge with this disease is that not every infected cockatiel looks sick. A bird may shed the organism intermittently, especially during stress, and expose cage mates or people before anyone realizes there is a problem. New birds entering a home or aviary are a common risk point if quarantine and screening are skipped.
Transmission to people usually happens when dried droppings or secretions become airborne during cage cleaning or handling. Direct contact is not always required. That is why careful hygiene, dust control, and early veterinary evaluation matter so much when psittacosis is suspected.
How Is Psittacosis (Chlamydiosis) in Cockatiels Diagnosed?
Diagnosis usually requires a combination of history, exam findings, and laboratory testing. Your vet may recommend bloodwork such as a complete blood count and chemistry panel to look for inflammation, infection, or liver changes. Because psittacosis can mimic other illnesses, these tests help build the bigger picture rather than confirm the disease by themselves.
Specific testing may include PCR testing on choanal, cloacal, or fecal samples, and sometimes blood-based testing for antibodies or immune response patterns. No single test is perfect. A positive PCR can show exposure or shedding, but results still need to be interpreted alongside symptoms and exam findings. A negative result also does not always rule it out, because birds may shed the organism intermittently.
If a bird in the household has died, tissue testing can sometimes help determine whether exposed birds should also be managed as potential cases. Because this disease has public health implications, your vet may also discuss isolation, cleaning precautions, and whether other birds in the home need evaluation.
Treatment Options for Psittacosis (Chlamydiosis) in Cockatiels
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Avian veterinary exam
- Targeted baseline testing, often one PCR or limited bloodwork
- Oral doxycycline plan directed by your vet, commonly a long course
- Home isolation from other birds
- Supportive care at home such as heat support, easier-to-eat foods, and careful monitoring
- Cleaning and dust-control instructions to reduce spread to people and other birds
Recommended Standard Treatment
- Avian exam and isolation plan
- CBC and chemistry panel to assess infection and liver involvement
- PCR testing from appropriate swabs or samples
- Doxycycline treatment for about 45 days as directed by your vet
- Recheck visit and possible repeat testing after treatment
- Supportive care such as fluids, nutritional support, probiotics or yeast monitoring when indicated, and treatment adjustments if side effects occur
Advanced / Critical Care
- Emergency avian assessment and hospitalization
- Oxygen support or intensive respiratory monitoring if breathing is compromised
- Injectable long-acting doxycycline or alternative administration methods when oral dosing is not tolerated
- Crop feeding, fluid therapy, warming support, and close weight monitoring
- Expanded diagnostics such as imaging or broader infectious disease workup when the diagnosis is unclear or complications are suspected
- Management of secondary problems such as dehydration, severe weakness, or yeast overgrowth risk during prolonged antibiotic therapy
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Psittacosis (Chlamydiosis) in Cockatiels
Bring these questions to your vet appointment to get the most out of your visit.
- Based on my cockatiel's signs, how strongly do you suspect psittacosis versus another respiratory or liver problem?
- Which tests do you recommend first, and what can each test tell us or miss?
- Does my bird need home isolation, and for how long should I keep them away from other birds?
- What doxycycline plan do you recommend for my cockatiel, and what side effects should I watch for during treatment?
- Should the other birds in my home be tested or treated because they were exposed?
- What cleaning steps lower human risk without creating dangerous fumes or stress for my bird?
- When should we schedule a recheck, and do you recommend repeat PCR or bloodwork after treatment?
- What signs mean my cockatiel needs emergency care before our next appointment?
How to Prevent Psittacosis (Chlamydiosis) in Cockatiels
Prevention starts with careful quarantine and screening of new birds. Any new cockatiel or other pet bird should be kept separate from resident birds and examined by your vet before introductions. Because some infected birds look normal, quarantine matters even when a bird appears healthy.
Good daily husbandry also lowers risk. Clean cages regularly, but avoid dry sweeping or actions that stir up dust from droppings. Lightly misting debris before removal, using appropriate bird-safe cleaning methods, washing hands after handling birds or cages, and improving ventilation can all reduce exposure. If psittacosis is suspected, your vet may recommend added precautions during cleaning and medication handling.
Stress reduction is another important part of prevention. Overcrowding, poor nutrition, transport, breeding stress, and sudden environmental changes may increase shedding in infected birds. A stable routine, clean housing, and prompt veterinary care for any sick bird help protect both your cockatiel and the people around them.
If anyone in the household develops flu-like illness after exposure to a sick bird, contact a physician and mention the bird exposure specifically. Early recognition helps people get the right testing and treatment faster.