Chlamydial Conjunctivitis in Macaws: Eye Signs of Psittacosis

Chlamydial conjunctivitis is inflammation of the tissues around the eye caused by infection with Chlamydia psittaci. In parrots, this infection is commonly called psittacosis or avian chlamydiosis. Macaws may show eye redness, swelling, and discharge, but the infection can also affect the respiratory tract, liver, and general health.

One tricky part is that some birds look only mildly sick at first. A macaw may start with one irritated eye, then develop nasal discharge, lethargy, reduced appetite, or changes in droppings over time. Because birds often hide illness until they are more seriously affected, early eye signs deserve attention.

This condition also matters for household health. Chlamydia psittaci is zoonotic, which means infected birds can sometimes spread it to people through inhaled dried secretions or droppings. That does not mean every red eye is psittacosis, but it does mean your vet should help sort out the cause quickly and safely.

The underlying cause is infection with Chlamydia psittaci, a bacterium carried by many psittacine birds. Birds can become infected through inhalation or ingestion of contaminated respiratory secretions, feather dust, or droppings. Shared air space matters, so a macaw does not always need direct beak-to-beak contact with another bird to be exposed.

Stress can make problems more likely to surface. Recent shipping, rehoming, boarding, breeding, overcrowding, poor ventilation, or another illness may increase shedding and make a previously infected bird more likely to show signs. Some birds can carry the organism with few outward symptoms and then become sick later.

Eye signs can also be worsened by secondary irritation. Dusty environments, poor sanitation, concurrent respiratory disease, or nutritional issues may make the conjunctiva more inflamed. That is why your vet will usually think beyond the eye itself and assess the whole bird, the home setup, and any other birds sharing the air space.

Diagnosis starts with a full avian exam and careful history. Your vet may ask about new birds in the home, recent boarding or travel, appetite, droppings, breathing, and whether anyone in the household has been ill. Because psittacosis can mimic other eye and respiratory problems, diagnosis should not rely on appearance alone.

Testing often includes PCR on combined conjunctival, choanal, and cloacal swabs, since shedding can vary by site and over time. In some cases, your vet may recommend pooled fecal samples collected over several days, bloodwork, or additional imaging if there are signs of systemic disease. Serology can show exposure, but it may not confirm active infection by itself.

Your vet may also look for other causes of conjunctivitis, such as trauma, foreign material, sinus disease, hypovitaminosis A, mycoplasma, or other bacterial infections. If your macaw is very sick, stabilization may happen first, with testing and treatment decisions adjusted to the bird's condition and the household's zoonotic risk.

Prevention starts with quarantine and screening. Any new bird should be kept separate from resident birds and examined by your vet before sharing air space. Good quarantine routines, careful handwashing, and separate food bowls, cleaning tools, and play areas can reduce the chance of bringing infection into the home.

Daily husbandry matters too. Keep the enclosure clean, control dust, improve ventilation, and remove droppings before they dry and become airborne. Avoid overcrowding and reduce stress from abrupt routine changes, transport, or poor sleep. If one bird becomes ill, isolate that bird promptly and follow your vet's cleaning instructions.

Routine wellness care helps catch subtle problems earlier. Regular avian exams, weight checks, and nutrition review can uncover issues that make infections harder to manage. If your macaw develops eye discharge, nasal discharge, or a sudden drop in energy, contact your vet early rather than waiting for more obvious illness.