Chlamydiosis-Associated Liver Disease in Macaws: Hepatic Signs of Psittacosis

Quick Answer
  • Chlamydiosis, also called psittacosis, is a bacterial infection caused by Chlamydia psittaci that can involve the liver as well as the eyes, lungs, air sacs, and intestines.
  • Macaws with liver involvement may show fluffed feathers, low appetite, weight loss, lethargy, lime-green or yellow-green droppings or urates, increased thirst, or a swollen abdomen.
  • This condition is zoonotic, which means people can get sick from infected birds. Careful handling, cage hygiene, and prompt veterinary testing matter.
  • Diagnosis usually combines an exam with bloodwork and PCR or other chlamydial testing, because no single test is perfect.
  • Treatment often requires a long antibiotic course, commonly doxycycline for about 45 days, plus supportive care tailored by your vet.
Estimated cost: $250–$2,500

What Is Chlamydiosis-Associated Liver Disease in Macaws?

Chlamydiosis-associated liver disease means a macaw has a Chlamydia psittaci infection that is affecting the liver. In parrots, this infection is often called psittacosis or avian chlamydiosis. It does not always stay in one body system. A bird may have respiratory signs, digestive signs, vague illness, or liver-related changes all at once.

When the liver is involved, your macaw may develop hepatitis, liver enlargement, abnormal liver enzymes on bloodwork, and changes in droppings such as yellow-green or lime-green staining of the feces or urates. Some birds look only mildly ill at first. Others become weak, dehydrated, and very sick over a short period.

This is an important condition because it can spread between birds and also infect people. That does not mean every exposed person becomes ill, but it does mean your vet may recommend isolation, careful cleaning, and testing of other birds in the home. Early veterinary care can improve the chance of recovery and reduce spread.

Symptoms of Chlamydiosis-Associated Liver Disease in Macaws

  • Lethargy or sitting fluffed up
  • Reduced appetite and weight loss
  • Lime-green, yellow-green, or stained droppings/urates
  • Wet or mushy droppings
  • Increased thirst and urination
  • Swollen or puffy abdomen
  • Breathing changes, nasal discharge, or eye discharge
  • Regurgitation or digestive upset

See your vet immediately if your macaw is having trouble breathing, is too weak to perch, has a swollen abdomen, stops eating, or shows rapid decline. Birds often hide illness until they are quite sick.

Even milder signs matter here because psittacosis can spread to other birds and to people. If you notice green-stained droppings, lethargy, or appetite changes, isolate the bird from other birds and call your vet the same day for guidance.

What Causes Chlamydiosis-Associated Liver Disease in Macaws?

The cause is infection with the bacterium Chlamydia psittaci. Macaws usually become infected by inhaling or ingesting contaminated material from droppings, feather dust, respiratory secretions, or dried debris in the environment. Close housing, poor ventilation, transport stress, breeding stress, and recent exposure to new birds can all increase risk.

Some parrots carry the organism without looking sick and may shed it off and on. That means a seemingly healthy bird can still expose a housemate. Infected birds may harbor the organism in tissues including the liver and intestines, which helps explain why some macaws develop hepatitis and abnormal droppings.

Liver signs happen when the infection becomes systemic or significantly involves hepatic tissue. Your vet may also consider other causes of liver disease at the same time, because green urates, weight loss, and lethargy are not unique to psittacosis. Toxins, fatty liver disease, heavy metal exposure, and other infections can look similar.

How Is Chlamydiosis-Associated Liver Disease in Macaws Diagnosed?

Diagnosis starts with a careful avian exam and a discussion of exposure history. Your vet will usually ask about new birds in the home, boarding, bird fairs, recent stress, appetite changes, droppings, breathing signs, and whether anyone in the household has been ill. Because psittacosis is zoonotic, that history matters.

Testing often includes CBC and chemistry, especially to look for inflammation and elevated liver enzymes, along with chlamydial testing such as PCR on choanal, conjunctival, and cloacal swabs. Some birds may also need radiographs to look for liver enlargement or air sac and lung changes. No single test is perfect, so your vet may combine results from the exam, lab work, and response to treatment.

In more complex cases, your vet may recommend repeat testing, bile acids, imaging, or sampling of liver tissue if the diagnosis remains unclear. The goal is not only to confirm chlamydiosis, but also to judge how much the liver is affected and whether your macaw needs outpatient care, hospitalization, or monitoring of other birds in the household.

Treatment Options for Chlamydiosis-Associated Liver Disease in Macaws

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

Budget-Conscious Care

$250–$700
Best for: Stable macaws that are still eating, breathing comfortably, and can be safely managed at home with close follow-up.
  • Avian exam and weight check
  • Basic bloodwork or focused diagnostics based on your vet’s findings
  • Chlamydial PCR or other targeted testing when feasible
  • Oral doxycycline or another vet-selected antibiotic plan
  • Home isolation, cage sanitation guidance, and recheck scheduling
  • Supportive care at home such as heat support, hydration support, and diet adjustments directed by your vet
Expected outcome: Fair to good when started early and the bird tolerates treatment well.
Consider: Lower upfront cost, but fewer diagnostics may leave other liver problems or complications less clearly defined. Home care also depends heavily on the pet parent’s ability to medicate and monitor the bird.
Most Common

Recommended Standard Treatment

$700–$1,500
Best for: Most macaws with suspected psittacosis and liver involvement that are sick enough to need a clear diagnosis and structured follow-up, but not in immediate critical collapse.
  • Full avian exam with isolation precautions
  • CBC, chemistry panel, and liver-focused assessment
  • PCR or combined chlamydial testing from appropriate swab sites
  • Radiographs if liver enlargement or respiratory disease is suspected
  • A full antibiotic course, commonly doxycycline for about 45 days if your vet confirms it is appropriate
  • Supportive care such as fluids, assisted feeding, liver monitoring, probiotics or GI support if indicated, and scheduled rechecks
Expected outcome: Good in many birds when diagnosis is timely, treatment is completed, and complications are limited.
Consider: More complete information and monitoring, but a higher cost range and multiple visits are common. Long treatment courses can be stressful for some birds.

Advanced / Critical Care

$1,500–$2,500
Best for: Macaws with severe lethargy, breathing difficulty, marked weight loss, dehydration, swollen abdomen, or failure of outpatient treatment.
  • Hospitalization with strict biosecurity
  • Expanded bloodwork, repeat chemistry testing, and advanced imaging
  • Oxygen support or respiratory stabilization if needed
  • Injectable medication protocols when oral dosing is not tolerated
  • Tube feeding, fluid therapy, and intensive supportive care
  • Monitoring for severe hepatitis, dehydration, secondary infections, and treatment response
  • Testing and management planning for exposed birds in the household or aviary
Expected outcome: Guarded to fair at presentation, improving with response to therapy and supportive care.
Consider: Most intensive option with the broadest monitoring, but it requires the highest cost range and may involve referral to an avian or exotic hospital.

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

Questions to Ask Your Vet About Chlamydiosis-Associated Liver Disease in Macaws

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

  1. Which of my macaw’s signs suggest liver involvement rather than only respiratory disease?
  2. What tests do you recommend first, and which ones are most useful if I need to prioritize costs?
  3. Do you suspect psittacosis strongly enough to isolate my macaw from other birds right now?
  4. What antibiotic plan are you recommending, and how long will treatment likely last?
  5. How will we monitor liver recovery during treatment?
  6. What side effects should I watch for with doxycycline or any other medication?
  7. Should my other birds be tested or treated because they were exposed?
  8. What cleaning and handling steps should my household follow to reduce human and bird exposure?

How to Prevent Chlamydiosis-Associated Liver Disease in Macaws

Prevention focuses on reducing exposure and catching infection early. Quarantine any new bird in a separate air space before introduction, and discuss screening with your vet before birds share rooms, cages, or play areas. Good ventilation, regular cleaning of droppings, and avoiding overcrowding also lower risk.

Because dried droppings and respiratory secretions can spread infectious material, clean cages in a way that limits dust. Damp-cleaning is safer than dry sweeping. Wash hands after handling birds, dishes, or cage papers, and use extra caution if anyone in the home is pregnant, immunocompromised, elderly, or has lung disease.

Routine wellness visits matter. A macaw that seems healthy can still carry and shed C. psittaci. If your bird develops lethargy, appetite loss, breathing changes, or green-stained droppings, contact your vet promptly rather than waiting to see if it passes. Early care helps protect your macaw, other birds, and the people around them.

Find a Vet Near You