Psittacosis: The Bird Disease That Can Spread to People, and How to Stay Safe
Psittacosis is a bacterial infection of birds that can also make people ill. It is treatable but easy to miss, because birds can carry it silently. This guide explains the signs in birds and humans, how it spreads through dust, who is most at risk, and the simple hygiene that keeps your whole household safe.
Quick answer
Psittacosis (also called parrot fever or chlamydiosis) is an infection caused by the bacterium Chlamydia psittaci. It affects birds, especially parrots, and can spread to people, causing a flu-like illness. It is treatable in both birds and humans, but it is easy to overlook because birds can carry it without obvious signs and shed it in dust and droppings. Good ventilation, damp cleaning and prompt veterinary care are the key protections. If someone in a bird household develops unexplained fever and a cough, tell the doctor about the bird contact — that one detail points straight to the right test.
- Cause
- the bacterium Chlamydia psittaci
- Zoonotic
- yes — birds can pass it to people
- Main route
- inhaling dried droppings / feather dust
- Human incubation
- usually about 5–14 days
- Treatable
- yes, with the right antibiotics (both species)
- Highest-risk moment
- dry-cleaning a new or sick bird's cage
Psittacosis is a bacterial infection of birds that can also make people ill.
What it is and how it spreads
Chlamydia psittaci is an unusual bacterium that lives inside cells, which is part of why it needs a specific, prolonged course of antibiotics rather than whatever is in the cupboard. It is shed in droppings, respiratory secretions and the fine feather dust birds naturally produce, especially powder-down species like cockatiels, cockatoos and African greys. People and other birds are usually infected by breathing in these dried particles. That is why cleaning a cage badly — dry-brushing or vacuuming droppings so they billow into the air — is one of the riskiest moments, and why a mask and a damp cloth matter so much.
Stress is the hidden trigger. A recent move, a new home, transport, breeding or overcrowding can prompt a bird that was quietly carrying the bacteria to start shedding it heavily. This is exactly why newly acquired birds, birds from crowded sources, and any recently stressed bird deserve particular caution. The bacterium can also survive for weeks in dried droppings and dust, so a contaminated environment stays a source of risk well after the bird itself seems fine.
Dampen droppings before cleaning and ventilate well — dry dust is how psittacosis spreads.
Signs in birds
Signs in birds are variable and often non-specific, which is exactly what makes psittacosis easy to miss. Watch for a cluster of these rather than any single one:
| Sign | What it looks like |
|---|---|
| Fluffed, puffed-up feathers | Bird sits round and hunched, often quiet |
| Lethargy, weakness | Sleeps more, less active, sits low |
| Not eating | Ignores favourite foods, losing weight |
| Eye or nasal discharge | Wet or crusty eyes/nostrils, sneezing |
| Breathing difficulty | Tail-bobbing, open-mouth breathing |
| Green / yellow-green droppings | Often lime-green urates, sometimes loose |
Some birds, especially otherwise healthy adults, carry the bacteria with no visible signs at all and only shed when stressed — the "silent carrier" that makes quarantine and hygiene matter even for a bird that looks perfectly well.
Signs in people and when to see a doctor
In people, psittacosis usually causes a flu-like illness: fever, headache, muscle aches, chills and a dry cough, sometimes progressing to pneumonia. It typically appears within about 5 to 14 days of exposure. Most cases are mild to moderate and respond well to treatment, but it can become serious, particularly if it is missed and left untreated.
The single most important thing you can do is tell your doctor you keep birds. Psittacosis is uncommon enough that it is easily mistaken for ordinary flu or COVID unless the bird contact is mentioned, and that one detail points straight to the right test and the right antibiotic — usually a tetracycline such as doxycycline, chosen by your doctor. Do not attempt to treat yourself, and never use your bird's medication.
Staying safe: everyday hygiene
Most of the risk is removed by a few simple habits, none of which require a mask-and-gloves routine for a healthy, settled bird — they are just good practice, dialled up when a bird is new or sick.
Keep cages out of the kitchen and away from where the family eats. Clean little and often so droppings never build up into a dusty layer. When you do a deep clean, dampen everything first, open a window, and consider a mask. Quarantine and, where appropriate, test new birds before adding them to your home or flock — several weeks apart, watched closely, is the single most effective step for a multi-bird household.
Psittacosis is treatable in birds and people, but needs a proper diagnosis and a full course.
A note on rules by region: psittacosis is a notifiable or reportable disease in many places (for example, in parts of the US, the UK, Australia and the EU), meaning confirmed human or bird cases are logged by public-health or veterinary authorities. This is routine surveillance, not a reason to hide a diagnosis — your vet and doctor will guide any reporting, and it does not mean your bird will be taken away.