Avian Chlamydiosis (Psittacosis) in Pet Birds

Quick Answer
  • Avian chlamydiosis, also called psittacosis or parrot fever, is a contagious bacterial infection caused by Chlamydia psittaci.
  • It can affect the lungs, liver, eyes, and digestive tract, and some birds carry the infection with few or no signs until stress triggers shedding.
  • Common signs include fluffed feathers, low appetite, weight loss, nasal or eye discharge, lime-green or yellow droppings, and lethargy.
  • This disease can spread to people, so careful handling, cage hygiene, and prompt veterinary care matter for both bird and household health.
  • Typical veterinary cost range in the U.S. is about $250-$900 for exam, testing, and outpatient treatment, with higher costs if hospitalization or flock testing is needed.
Estimated cost: $250–$900

What Is Avian Chlamydiosis (Psittacosis) in Pet Birds?

Avian chlamydiosis is an infectious disease caused by the bacterium Chlamydia psittaci. You may also hear it called psittacosis, parrot fever, or avian chlamydiosis. It is seen most often in psittacine birds such as parrots, cockatiels, budgies, macaws, and conures, but other bird species can be affected too.

This infection can act like a whole-body illness, not only a breathing problem. In pet birds, it may involve the respiratory tract, liver, spleen, eyes, and digestive system. Some birds become clearly sick, while others carry the organism and shed it in droppings or respiratory secretions during times of stress, crowding, transport, breeding, or illness.

Because C. psittaci is zoonotic, it can spread from birds to people. That does not mean every exposed person gets sick, but it does mean families should take the diagnosis seriously. If your bird has signs that fit psittacosis, or if anyone in the home develops flu-like or respiratory symptoms after bird exposure, contact your vet and a human healthcare professional promptly.

Symptoms of Avian Chlamydiosis (Psittacosis) in Pet Birds

  • Fluffed feathers and quiet, withdrawn behavior
  • Low appetite or refusing favorite foods
  • Weight loss or poor body condition
  • Lime-green or yellow droppings, sometimes with increased urine
  • Nasal discharge, sneezing, or noisy breathing
  • Eye redness, swelling, or discharge
  • Lethargy or sleeping more than usual
  • Regurgitation or diarrhea
  • Labored breathing, weakness, or collapse
  • Sudden death

Birds often hide illness until they are quite sick. That is why subtle changes matter. A bird that is puffed up, eating less, quieter than normal, or passing discolored droppings should be seen by your vet soon.

See your vet immediately if your bird has trouble breathing, is sitting low on the perch, is weak, has stopped eating, or if multiple birds in the home are showing signs. Also act quickly if anyone in the household develops fever, cough, headache, or flu-like symptoms after exposure to a sick bird or dusty cage.

What Causes Avian Chlamydiosis (Psittacosis) in Pet Birds?

Avian chlamydiosis is caused by the bacterium Chlamydia psittaci. Infected birds can shed the organism in droppings, nasal secretions, and eye discharge. Other birds usually become infected by inhaling contaminated dust from dried droppings or feather debris, though direct contact and contaminated food bowls, cages, and hands can also play a role.

A challenging part of this disease is that some birds look normal while still carrying and shedding the organism. Shedding may increase during stress, including shipping, rehoming, breeding, overcrowding, poor sanitation, or another illness. That means a newly purchased bird, a bird returning from boarding, or a bird introduced without quarantine can expose the rest of the household flock.

Psittacine birds are commonly discussed because they are frequent pet species, but infection is not limited to parrots. Your vet may be more suspicious if there is a history of recent bird exposure, bird shows, rescue intake, breeding collections, or unexplained illness in more than one bird.

How Is Avian Chlamydiosis (Psittacosis) in Pet Birds Diagnosed?

Diagnosis usually starts with a careful history and physical exam. Your vet will ask about new birds in the home, recent travel or boarding, contact with other birds, changes in droppings, appetite, breathing, and whether any people in the household are sick. Because the signs overlap with many other bird illnesses, psittacosis cannot be confirmed by symptoms alone.

Testing often includes bloodwork and a PCR test on choanal, cloacal, or fecal samples to look for C. psittaci genetic material. PCR has made diagnosis more practical, but no single test is perfect. A positive antibody test may show exposure rather than active infection, and a negative result does not always rule it out if the bird is shedding intermittently or has already started treatment.

Your vet may also recommend radiographs, fecal testing, or additional infectious disease testing to look for other causes of weight loss, liver disease, or respiratory signs. In birds that die unexpectedly, necropsy and tissue testing can be very helpful for confirming the diagnosis and guiding care for exposed flockmates.

Treatment Options for Avian Chlamydiosis (Psittacosis) in Pet Birds

Spectrum of Care means you have options. Here are treatment tiers at different price points.

Budget-Conscious Care

$250–$500
Best for: Stable birds that are still eating, breathing comfortably, and can be managed safely at home with close follow-up
  • Office exam with avian-focused history and physical
  • Targeted PCR testing or treatment based on strong clinical suspicion when testing is limited
  • Oral doxycycline plan prescribed and monitored by your vet, often for about 45 days
  • Home isolation from other birds
  • Supportive care at home such as heat support, easier-to-eat foods, and hydration guidance
  • Basic sanitation plan to reduce contaminated dust and droppings exposure
Expected outcome: Often fair to good when treatment is started early and the full medication course is completed.
Consider: Lower upfront cost, but less monitoring can miss dehydration, weight loss, liver changes, or medication intolerance. If the diagnosis is presumptive rather than confirmed, another disease could be missed.
Most Common

Recommended Standard Treatment

$500–$1,200
Best for: Most pet birds with suspected or confirmed psittacosis that are sick enough to need a clear diagnosis and follow-up but not in critical distress
  • Exam with isolation precautions
  • PCR testing plus bloodwork, and sometimes radiographs
  • Vet-directed doxycycline treatment for the full recommended course, commonly around 45 days in many species
  • Weight checks and recheck visits during treatment
  • Supportive care such as fluids, nutritional support, and treatment of eye or respiratory irritation if needed
  • Guidance for testing or monitoring exposed birds in the household
Expected outcome: Good in many uncomplicated cases when birds tolerate treatment and environmental control is strong.
Consider: Higher cost range than conservative care, and repeated visits may be needed. Some birds resist oral medication, and flock management can add cost and effort.

Advanced / Critical Care

$1,200–$3,500
Best for: Birds with severe weakness, breathing trouble, marked weight loss, dehydration, or households with multiple exposed birds and complex management needs
  • Hospitalization with oxygen or incubator support for birds in respiratory distress
  • Injectable medication protocols when oral dosing is not tolerated or practical
  • Crop feeding, fluid therapy, and intensive nutritional support
  • Radiographs, repeat bloodwork, and broader infectious disease workup
  • Management of severe liver involvement, dehydration, or secondary infections
  • Flock-level planning for multi-bird homes, rescue situations, or breeding collections
Expected outcome: Guarded to fair in critical cases, but some birds recover well with aggressive supportive care and a complete treatment course.
Consider: Most intensive option with the highest cost range. Hospital stress can be significant for some birds, and advanced care may still require weeks of home treatment afterward.

Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.

Questions to Ask Your Vet About Avian Chlamydiosis (Psittacosis) in Pet Birds

Bring these questions to your vet appointment to get the most out of your visit.

  1. Which signs in my bird make psittacosis more or less likely?
  2. What tests do you recommend first, and what can each test tell us?
  3. If the PCR is negative, would you still consider treatment based on symptoms and exposure history?
  4. Does every bird in my home need testing, treatment, quarantine, or monitoring?
  5. What medication form is most practical for my bird: oral, medicated feed, or injectable treatment?
  6. What side effects should I watch for during doxycycline treatment?
  7. How should I clean the cage and room safely without creating contaminated dust?
  8. When is it safe for my bird to be around other birds again, and do we need repeat testing?

How to Prevent Avian Chlamydiosis (Psittacosis) in Pet Birds

Prevention starts with quarantine and hygiene. Any new bird should be kept separate from resident birds for a meaningful quarantine period directed by your vet, ideally with separate air space, bowls, and cleaning tools when possible. Routine veterinary exams for new birds and prompt testing of sick birds can reduce the chance of silent spread.

Clean cages and perches in a way that limits dust. Moisten droppings before removal rather than dry sweeping or vacuuming dusty debris into the air. Wash hands after handling birds, cages, bowls, or droppings. If your bird is being evaluated for psittacosis, your vet may recommend extra precautions for immunocompromised people, older adults, pregnant people, or anyone with respiratory disease.

Good daily care also matters. Stress reduction, proper nutrition, avoiding overcrowding, and keeping cages clean can lower the risk of disease flare-ups and spread. If one bird in a multi-bird home is diagnosed, follow your vet's plan closely for isolation, treatment, rechecks, and environmental cleaning. Completing the full treatment course is important because stopping early can allow relapse and continued shedding.

Find a Vet Near You