Chlamydiosis in Macaws: Respiratory Signs, Testing, and Zoonotic Risk
- See your vet immediately if your macaw has labored breathing, tail bobbing, weakness, or green droppings with respiratory signs.
- Chlamydiosis, also called psittacosis or avian chlamydiosis, is caused by Chlamydia psittaci and can spread to people.
- Macaws may show nasal discharge, conjunctivitis, fluffed feathers, poor appetite, weight loss, diarrhea, or may carry the infection with few obvious signs.
- Diagnosis often needs more than one test, such as PCR on choanal or cloacal swabs plus bloodwork and imaging when illness is more severe.
- Treatment commonly involves doxycycline for about 45 days, along with isolation, cage hygiene, and supportive care directed by your vet.
What Is Chlamydiosis in Macaws?
Chlamydiosis in macaws is an infectious disease caused by the bacterium Chlamydia psittaci. In birds, it is often called avian chlamydiosis. In people, infection from birds is called psittacosis or parrot fever. Macaws and other parrots are among the species commonly associated with this disease.
This infection can affect the respiratory tract, eyes, liver, digestive tract, and general energy level. Some macaws become obviously sick, while others shed the organism off and on with only mild signs or no clear signs at all. That makes early veterinary evaluation especially important when a macaw develops breathing changes, eye discharge, or unexplained lethargy.
Because this disease can spread to humans, it is both a bird health issue and a household safety issue. Pet parents should avoid close face-to-face contact, use careful hand hygiene, and contact your vet promptly if chlamydiosis is suspected. If anyone in the home develops flu-like illness or pneumonia after bird exposure, they should contact a physician and mention the bird exposure.
Symptoms of Chlamydiosis in Macaws
- Nasal discharge or sneezing
- Labored breathing, open-mouth breathing, or tail bobbing
- Conjunctivitis or eye discharge
- Fluffed feathers, lethargy, or sleeping more
- Poor appetite and weight loss
- Green droppings, diarrhea, or abnormal urates
- Weakness or dehydration
- Sudden decline after stress, boarding, transport, or a new bird exposure
See your vet immediately if your macaw is struggling to breathe, sitting low on the perch, weak, or not eating. Birds can worsen quickly, and respiratory distress is always urgent. Even milder signs like sneezing, eye discharge, or green droppings deserve prompt attention because macaws may shed Chlamydia psittaci before the illness looks dramatic.
What Causes Chlamydiosis in Macaws?
Chlamydiosis is caused by infection with Chlamydia psittaci, a bacterium that spreads mainly through inhalation or ingestion of contaminated dust, dried droppings, respiratory secretions, or feather debris. A macaw can become infected after contact with another bird, contaminated cages or bowls, transport carriers, or environments where infected material has dried and become airborne.
Stress often plays a major role. Recent shipping, rehoming, boarding, breeding activity, overcrowding, poor ventilation, or another illness can increase shedding and make signs more noticeable. This is one reason a bird may seem healthy for a while and then become sick after a stressful event.
New birds are a common source of exposure in multi-bird homes. Because some infected birds appear normal, quarantine and screening matter. Pet parents should also know that transmission to people can happen even when the bird's signs are mild, so suspected cases should be handled carefully until your vet advises otherwise.
How Is Chlamydiosis in Macaws Diagnosed?
Diagnosis usually starts with a full avian exam and a careful history. Your vet may ask about recent bird purchases, boarding, travel, breeding, exposure to other parrots, changes in droppings, and whether anyone in the home has become sick. Because signs can overlap with other bird illnesses, chlamydiosis is rarely confirmed by symptoms alone.
Testing often includes PCR on choanal, conjunctival, or cloacal swabs, and sometimes fecal samples. Bloodwork can help look for inflammation, dehydration, or liver involvement. In a sicker macaw, your vet may also recommend radiographs to assess the lungs, air sacs, and liver size. Some cases need repeat or combined testing because birds may shed the organism intermittently, and one negative result does not always rule it out.
Culture is not commonly used in routine practice because of biosafety concerns. In practical terms, many avian vets diagnose based on a combination of exam findings, PCR results, bloodwork, and response to treatment. If chlamydiosis is confirmed or strongly suspected, your vet may also discuss household precautions and whether other birds in the home should be tested or managed as exposed contacts.
Treatment Options for Chlamydiosis in Macaws
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Avian exam and weight check
- Isolation from other birds
- Targeted PCR testing if finances allow, or treatment based on strong clinical suspicion
- Oral doxycycline plan directed by your vet, often for about 45 days
- Home supportive care such as warmth, easier access to food and water, and careful cage sanitation
- Basic recheck visit
Recommended Standard Treatment
- Avian exam with full history and zoonotic counseling
- PCR testing from choanal and/or cloacal sites
- CBC and chemistry panel
- Doxycycline treatment for about 45 days in the form your vet feels is most appropriate
- Supportive care such as fluids, nutritional support, probiotics or yeast monitoring as needed, and environmental optimization
- At least one to two rechecks with weight tracking and response assessment
- Guidance for testing or managing exposed birds in the household
Advanced / Critical Care
- Emergency stabilization for respiratory distress
- Hospitalization with oxygen support, fluids, assisted feeding, and thermal support
- Expanded diagnostics such as radiographs and repeat bloodwork
- Injectable or closely supervised antibiotic treatment when oral dosing is difficult or the bird is unstable
- Monitoring for liver involvement, dehydration, and secondary infections
- More intensive discharge planning for quarantine, sanitation, and follow-up testing
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Chlamydiosis in Macaws
Bring these questions to your vet appointment to get the most out of your visit.
- Which tests do you recommend first for my macaw, and what can each test tell us?
- If the first PCR is negative, when would repeat testing still make sense?
- Does my macaw need home treatment or hospitalization based on the breathing signs you are seeing?
- What form of doxycycline is most practical for my bird, and how long will treatment last?
- What side effects should I watch for during treatment, including appetite changes or yeast overgrowth?
- Should my other birds be tested, quarantined, or treated as exposed contacts?
- What cleaning steps reduce spread in the home without creating more airborne dust?
- What symptoms in people should prompt us to contact a physician and mention bird exposure?
How to Prevent Chlamydiosis in Macaws
Prevention starts with quarantine and screening. Any new bird should be kept separate from resident birds and examined by your vet before introductions. Because apparently healthy parrots can still shed Chlamydia psittaci, testing new arrivals is a practical step in many homes, aviaries, rescues, and breeding settings.
Daily husbandry matters too. Good ventilation, regular cage cleaning, prompt removal of droppings, and avoiding dry sweeping help reduce contaminated dust. When cleaning around a suspected or confirmed case, dampen debris first rather than stirring it into the air. Wash hands after handling birds, cages, bowls, or droppings, and avoid kissing birds or holding them close to your face.
Reducing stress can also lower risk. Stable routines, appropriate nutrition, clean housing, and avoiding overcrowding all support immune health. If your macaw develops respiratory signs, eye discharge, lethargy, or abnormal droppings, isolate the bird and contact your vet promptly. Early action protects your bird, other birds in the home, and the people caring for them.