Parrot fever, known medically as psittacosis, is a bacterial lung infection that humans catch from birds. It’s caused by Chlamydia psittaci, a type of bacteria that commonly lives in birds and can become airborne through their droppings, feathers, and respiratory secretions. Most cases are mild and resemble the flu, but without treatment, the mortality rate sits around 20%. With timely antibiotics, that drops to roughly 1%.
How You Catch It
The bacteria live inside the cells of infected birds. When those birds shed the organism in their droppings or nasal discharge, the material dries and becomes part of the dust around cages, coops, and roosting areas. You get infected by breathing in that contaminated dust. You don’t need to touch the bird directly, and you don’t need prolonged exposure. Simply cleaning a cage, sweeping near dried droppings, or spending time in a poorly ventilated space with infected birds can be enough.
Person-to-person spread is extremely rare. This is almost exclusively a bird-to-human disease.
It’s Not Just Parrots
The name “parrot fever” is misleading. While parrots, parakeets, cockatiels, and macaws are well-known carriers, the bacteria infect a wide range of bird species. Pigeons and doves are particularly common hosts. The infection is considered endemic in the turkey industry, and ducks, geese, gulls, and crows also carry it. Essentially, any bird species can harbor Chlamydia psittaci, whether it’s a pet, farm animal, or wild bird in a park.
People at the highest risk include pet bird owners, bird breeders, poultry workers, veterinarians, and anyone who works in pet shops or wildlife rehabilitation. But cases also turn up in people with no obvious bird contact, likely from incidental exposure to wild bird droppings.
Symptoms and Timeline
Most people develop symptoms within 5 to 14 days of breathing in the bacteria, though it occasionally takes longer. The illness typically starts like a respiratory infection and can easily be mistaken for the flu or a common pneumonia. The most frequent symptoms are:
- Dry cough that may persist for weeks
- Fever and chills
- Headache, often severe
- Muscle aches
For most people, psittacosis stays mild. But in some cases, the infection progresses to severe pneumonia. This is where the real danger lies, particularly for older adults or people with weakened immune systems. Untreated severe cases can lead to organ complications, though this is uncommon with modern medical care.
How It’s Diagnosed
Psittacosis is notoriously underdiagnosed because its symptoms overlap with so many other respiratory illnesses. Doctors may not think to ask about bird exposure, and standard chest X-rays can’t distinguish it from other types of pneumonia. The CDC uses a DNA-based test (PCR) on respiratory samples to identify the bacteria directly. Blood antibody testing, which was once common, is no longer used as a routine method because it’s less reliable. In certain situations, the bacteria can also be grown in a lab culture.
If you develop a persistent cough and fever and you’ve had any contact with birds, mentioning that exposure to your doctor is one of the most important things you can do. It can be the detail that points the diagnosis in the right direction.
Treatment and Recovery
Psittacosis responds well to antibiotics in the tetracycline family. Most people take oral medication twice a day and start feeling noticeably better within 48 to 72 hours. That quick improvement can be tempting to interpret as a signal to stop treatment, but the full course is essential. Treatment continues for at least 10 to 14 days after your fever breaks to prevent relapse, which means the total course often runs several weeks. For people who can’t take tetracyclines, such as young children and pregnant women, alternative antibiotics are available.
Severe cases that require hospitalization may start with intravenous medication before transitioning to oral treatment. But the vast majority of people recover at home with pills.
Recent Outbreaks in Europe
Psittacosis made international headlines in early 2024 when five European countries reported unusual spikes in cases. Austria, Denmark, Germany, Sweden, and the Netherlands all saw sharp increases beginning in late 2023. Austria reported 14 confirmed cases in 2023 compared to a typical median of just two per year. Sweden saw numbers double compared to the same months in previous years, with 19 cases in December 2023 alone. The Netherlands identified 21 positive individuals by the end of February 2024, twice the usual rate. Five deaths were reported across these countries.
The WHO flagged the situation as an unexpected regional increase, though it stopped short of calling it a pandemic-level threat. The cause of the coordinated spike remains unclear, but it served as a reminder that psittacosis is more common than most people realize and likely goes undetected in many cases.
Preventing Infection
If you own pet birds or work around them, a few practical habits significantly reduce your risk. The most important is avoiding dry dust. Never dry-sweep or vacuum around bird cages, because this launches contaminated particles into the air. Instead, wet down surfaces and cages with water or disinfectant before cleaning. Wash your hands thoroughly with soap and running water after touching birds, their droppings, or anything inside their cages.
For people who keep multiple birds, overcrowding is a major risk factor. Don’t stack cages on top of each other, as droppings and feather dust drift downward and contaminate birds below. Use solid-sided barriers between adjacent cages. Clean food bowls, water dishes, and cage floors daily. If one of your birds appears sick, showing ruffled feathers, discharge from the eyes, or lethargy, isolate it from the others and have it evaluated by a veterinarian. Infected birds can shed enormous quantities of the bacteria, especially when stressed.
Wearing gloves and a well-fitting mask when handling sick birds or cleaning their enclosures adds another layer of protection, particularly in enclosed spaces with limited airflow.