Do pigeons carry Chlamydia?

Pigeons can potentially carry and transmit chlamydia, a common sexually transmitted disease in humans. However, the strains of chlamydia that infect birds are different from the ones that infect humans.

Can pigeons get chlamydia?

Yes, pigeons can become infected with strains of chlamydia that are specific to birds. There are multiple species of Chlamydia that can infect birds, including:

  • Chlamydia psittaci – Also known as psittacosis or parrot fever, this bacteria causes respiratory problems in birds. It can spread to humans and cause a serious pneumonia called psittacosis.
  • Chlamydophila abortus – This species mostly infects sheep and goats, but can also infect pigeons. It causes birds to abort their eggs or give birth to weak offspring.
  • Chlamydophila pecorum – Causes inflammation and symptoms similar to psittacosis in birds. It can potentially infect cows, sheep, goats, and pigs as well.

Of these, C. psittaci is the most common species found in pigeons. One study found that 15% of feral pigeons in a city population were carrying C. psittaci. Rates of infection are higher in domesticated bird populations.

Can pigeons spread chlamydia to humans?

Yes, pigeons can potentially transmit chlamydia to humans, specifically C. psittaci. This occurs through:

  • Inhaling dried bird droppings – Psittacosis infection often happens when people breathe in dust from dried bird droppings that contain C. psittaci bacteria.
  • Handling infected birds – People who handle infected pigeons can get exposed to psittacosis, especially if the birds are sick shedding large amounts of bacteria.
  • Eating infected birds – Consuming meat from infected pigeons can potentially transmit the bacteria too.

However, human cases of psittacosis originating from pigeons are relatively rare compared to parrots and other birds. The strain of chlamydia most common in humans (Chlamydia trachomatis) is different from the C. psittaci found in birds.

What are the symptoms of chlamydia in pigeons?

Infected pigeons may show these signs of chlamydia infection:

  • Conjunctivitis (eye inflammation) with ocular discharge
  • Nasal discharge
  • Coughing and breathing difficulties
  • Lethargy and ruffled feathers
  • Green diarrhea
  • Loss of appetite and weight loss
  • Abortion of eggs

Symptoms are often more noticeable in domesticated pigeons compared to feral ones. C. psittaci infection can be extremely deadly in birds, with mortality rates up to 60% in untreated pet birds.

What are the symptoms of psittacosis in humans?

If a person develops psittacosis after exposure to an infected pigeon, they may experience:

  • Fever, chills, headache
  • Cough and breathing problems
  • Nausea, vomiting, diarrhea
  • Muscle aches
  • Pink eye (conjunctivitis)

Symptoms begin around 5-14 days after exposure to the bacteria. Most people recover fully with antibiotic treatment, but complications like pneumonia, hepatitis, or heart problems can occur.

How is chlamydia diagnosed in birds?

To check a pigeon or other bird for chlamydia, vets may perform:

  • PCR test – Using a swab sample from the bird’s cloaca or respiratory tract, a PCR test looks for the DNA of Chlamydia bacteria.
  • Serology test – A blood sample is tested for antibodies against Chlamydia, indicating past or current infection.
  • Microscopy – Chlamydia organisms can be viewed under a microscope in samples from infected birds.
  • Necropsy – If a bird died from the infection, Chlamydia bacteria can be identified in its organs and tissues.

Testing can determine the specific species of Chlamydia as well – important for appropriate treatment and zoonosis monitoring.

How is psittacosis diagnosed in humans?

If psittacosis is suspected in a person, doctors may use these diagnostic techniques:

  • PCR – A respiratory sample is tested by polymerase chain reaction for C. psittaci DNA.
  • Serology – Blood is analyzed for elevated antibody levels against the bacteria.
  • Chest X-ray – Can detect pneumonia signs associated with psittacosis.
  • Testing birds – If a sick bird is identified as the source of infection, testing it can help confirm psittacosis.

Diagnosis can be challenging as symptoms resemble other respiratory infections. Doctors may prescribe antibiotics even with a tentative diagnosis to minimize complications.

How is chlamydia treated in pigeons?

Chlamydia infections are treated with antibiotics in pigeons. Commonly used antibiotics include:

  • Doxycycline
  • Tetracycline
  • Enrofloxacin
  • Erythromycin

Treatment is most effective when started early before symptoms appear. Birds require 3-6 weeks of medication to fully recover. Isolating sick birds prevents transmission during treatment.

Without treatment, chlamydia can persist long-term in birds and cause serious illness. Treating infected birds improves the health of the flock and prevents spread to new birds.

How is psittacosis treated in humans?

Doctors prescribe antibiotics to treat psittacosis pneumonia in people. Commonly used antibiotics include:

  • Doxycycline – Often the first line treatment.
  • Tetracycline
  • Erythromycin
  • Azithromycin

Taking antibiotics quickly reduces symptoms and prevents severe complications. People are usually treated for 10-14 days or until fever resolves. Coughing and fatigue may persist longer during recovery.

People at high risk for psittacosis (bird owners, vets) may be given preventive antibiotics after exposure to infected birds. A psittacosis vaccine for humans is currently unavailable.

How can pigeon chlamydia infection be prevented?

Preventing chlamydia outbreaks in pigeons involves:

  • Buying birds only from reputable sources that test for disease
  • Quarantining new birds before introducing them to the flock
  • Regularly disinfecting lofts and cages
  • Avoiding contamination of feed and water
  • Promptly separating sick birds for treatment
  • Culling birds who fail to respond to medication
  • Discouraging contact with wild birds

Vaccines for Chlamydophila psittaci are also available for pigeons. Annual vaccination protects breeding flocks from outbreaks.

How can human psittacosis be prevented?

To avoid getting psittacosis from infected pigeons, some prevention tips include:

  • Wearing an N95 mask when cleaning bird cages or lofts
  • Wetting down droppings before removal to reduce dust
  • Washing hands thoroughly after handling birds
  • Avoiding nuzzling or kissing pet birds
  • Having birds tested by a vet for illness
  • Cooking pigeon meat thoroughly before eating

At risk individuals like pigeon breeders should talk to their doctor about preventive antibiotics if they have had unprotected exposure to sick birds.

Key Points

  • Pigeons can get infected with Chlamydia psittaci, which can cause psittacosis in humans.
  • The chlamydia species that infects pigeons is different from the usual human strain.
  • Psittacosis transmission from pigeons to humans is rare compared to other birds.
  • Prevention involves protecting both pigeon and human health using proper hygiene, protective gear, testing, and medication.


In summary, pigeons are susceptible to Chlamydia psittaci infection which can potentially spread to humans through exposure to bird droppings, meat, or secretions. However, human cases of the resulting psittacosis pneumonia remain relatively uncommon. With prompt testing, treatment, and prevention strategies focused on the health of the birds and their human handlers, the risks of disease transmission can be significantly reduced.

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