Avian Chlamydiosis (Psittacosis)
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
Can infect peopleWet contaminated material before cleaning, avoid creating airborne dust and seek human medical advice if illness follows bird exposure.
Manage the whole exposed groupSeparate the suspect bird and obtain veterinary guidance for contact birds, testing, treatment and clearance.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Avian chlamydiosis is systemic infection with the intracellular bacterium Chlamydia psittaci. It affects many bird orders and is particularly recognised in parrots, pigeons and doves. Infected birds shed organisms in faeces and ocular or respiratory secretions; dried material can become airborne. Some remain outwardly healthy carriers and shed intermittently, especially after transport, breeding, crowding or illness.
Clinical expression varies with strain, species, age, dose and stress. Signs include lethargy, anorexia, weight loss, conjunctivitis, nasal discharge, dyspnoea, diarrhoea and green-stained urates from liver involvement. Acute disease may cause sudden death, while chronic cases show vague wasting. The same signs occur with many bacterial, viral and hepatic disorders, and a normal-looking newly purchased bird can still introduce infection.
Psittacosis is the corresponding human disease and can cause serious atypical pneumonia. People acquire it mainly by inhaling contaminated dust rather than from a bite. Cage cleaning, necropsy and handling ill birds create exposure, with greater concern for older, pregnant or immunocompromised people. Reporting and quarantine obligations vary by jurisdiction.
The organism is bacterial—not viral—and prolonged correctly delivered antimicrobial treatment is central to control. Treatment suppresses illness and shedding but does not guarantee elimination of every latent infection. False-negative tests occur when shedding is low or antimicrobials have begun. Prognosis is good with early therapy and guarded in severely dyspnoeic or systemically compromised birds. Collection control requires treatment compliance, environmental cleaning, contact management and public-health advice rather than simply moving the symptomatic bird to another cage. Chlamydia psittaci is an intracellular bacterium, not a virus. Infected birds may show respiratory disease, conjunctivitis, green urates, weight loss or no signs while intermittently shedding the organism. Stress can increase shedding. The infection is zoonotic, and people may develop serious flu-like or pneumonic illness after inhaling contaminated dust.
Screening & Early Detection
Quarantine new or returning birds in separate airspace and arrange an avian examination before mixing. Record source, species, recent transport, contact birds and human respiratory illness. Observe droppings, urate colour, weight, appetite, eyes and breathing; carriers may lack clinical signs.
PCR on appropriately collected conjunctival, choanal and cloacal material is combined with serology in many cases. PCR detects organism DNA and can be negative during intermittent shedding or after antibiotics; serology shows immune exposure and does not alone prove active infection. Repeated sampling and laboratory-specific handling improve interpretation. Complete blood count, chemistry and imaging assess liver and respiratory involvement.
A suspect bird is not carried through a shared waiting room without prior clinic instructions. People cleaning its enclosure minimise dust, use protective measures advised by health authorities and seek their own medical advice after compatible exposure. Test results are interpreted across the collection rather than declaring one negative swab a permanent clearance. Follow-up testing is timed after the full treatment course according to regulatory and veterinary guidance. PCR testing is most useful when samples and timing reflect intermittent shedding; combined choanal and cloacal swabs or serial samples may improve detection. Antibody tests indicate exposure but do not always prove active infection. Blood changes and liver enlargement can support suspicion, while laboratories and public-health requirements vary by jurisdiction.
Treatment & Management
Doxycycline or another appropriate tetracycline is given at a species-validated dose and uninterrupted duration, commonly several weeks. Route is chosen to maintain reliable drug exposure; medication in communal water can fail when intake varies, while some injectable formulations cause tissue reactions. Calcium sources may interfere with oral tetracycline absorption and are managed without creating nutritional deficiency.
Treat clinically affected birds and manage contacts as directed by the veterinarian and local regulations. Dyspnoeic birds receive oxygen, warmth, fluids and nutritional support with minimal handling. Clean cages wet to prevent aerosolising dust, remove organic debris before disinfection and use dedicated equipment. Staff protect themselves and notify public-health or animal-health authorities where required.
Daily gram weights, appetite and droppings detect medication intolerance or deterioration. Do not stop when signs improve; intracellular organisms at different life stages require sustained therapy. Repeat testing follows an appropriate post-treatment interval. Persistent positives prompt review of dose delivery, reinfection and carrier status rather than arbitrary drug switching. The bird remains separated until the veterinary and regulatory clearance plan is satisfied. Future prevention includes quarantine, source testing, ventilation and avoiding overcrowding. Doxycycline is commonly used for a prolonged course because the organism lives within cells. All exposed birds may require assessment, and calcium-rich foods or supplements can interfere with some oral formulations. Cleaning should dampen debris before removal to avoid aerosolising faecal or feather dust, with human medical advice sought after exposure symptoms.
Breeds or species affected
Adelaide Rosella
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Bar-shouldered Dove
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Blue-faced Parrot Finch
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Bourke's Parrot
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Brown Quail
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Budgerigar
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Cockatiel
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Common Bronzewing
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Crested Pigeon
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Diamond Dove
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Eastern Rosella
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Elegant Parrot
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Emerald Dove
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Galah
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Gouldian Finch
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Hooded Parrot
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King Quail
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Little Button-quail
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Little Corella
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Long-billed Corella
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Musk Lorikeet
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Painted Button-quail
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Painted Finch
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Pale-headed Rosella
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Peaceful Dove
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Port Lincoln Parrot
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Princess Parrot
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Rainbow Lorikeet
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Red-capped Parrot
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Red-collared Lorikeet
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Red-rumped Parrot
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Scaly-breasted Lorikeet
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Scarlet-chested Parrot
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Star Finch
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Stubble Quail
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Sulphur-crested Cockatoo
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Twenty-eight Parrot
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Western Corella
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Western Rosella
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Yellow Rosella
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Zebra Finch
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Canary
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Society Finch
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Domestic Pigeon
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Indian Ringneck Parakeet
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Alexandrine Parakeet
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Peach-faced Lovebird
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Fischer's Lovebird
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Sun Conure
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Jenday Conure
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