Chlamydophila spp

From Dog
Chlamydophila psittaci visualized under light microscopy

Chlamydophila spp are an obligate intracellular Gram-negative zoonotic[1] aerobic bacteria found in most animals.

Reports of canine chlamydiosis are uncommon, but recurrent keratoconjunctivitis[2], pneumonitis[3], rhinitis[4] and stillborns have been reported.

Species which are pathogenic to dogs include:

  • Chlamydophila psittaci[5]
  • Chlamydophila caviae[6]
  • Chlamydophila abortus

These organisms are commonly found systemically in atherosclerotic lesions within canine bloods vessels[7].

Diagnosis is based on detection of circulating antibodies via ELISA[8][9] or tissue detection using PCR assays.

Treatment is relatively effective with doxycycline.


  1. Gresham AC et al (1996) Domiciliary outbreak of psittacosis in dogs: potential for zoonotic infection. Vet Rec 138(25):622-623
  2. Hoelzle K et al (2005) Chlamydophila abortus-induced keratoconjunctivitis in a dog. Vet Rec 157(20):632-633
  3. Sprague LD et al(2009) The detection of Chlamydophila psittaci genotype C infection in dogs. Vet J 181(3):274-279
  4. Windsor RC et al (2006) Molecular detection of microbes in nasal tissue of dogs with idiopathic lymphoplasmacytic rhinitis. J Vet Intern Med 20(2):250-256
  5. Arizmendi F et al (1992) Isolation of Chlamydia psittaci from pleural effusion in a dog. J Vet Diagn Invest 4(4):460-463
  6. Pantchev A et al (2010) Detection of all Chlamydophila and Chlamydia spp. of veterinary interest using species-specific real-time PCR assays. Comp Immunol Microbiol Infect Dis 33(6):473-484
  7. Sako T et al (2002) Chlamydial infection in canine atherosclerotic lesions. Atherosclerosis 162(2):253-259
  8. Fukushi H et al (1985) Seroepidemiological surveillance of Chlamydia psittaci in cats and dogs in Japan. Vet Rec 117(19):503-504
  9. Werth D et al (1987) Demonstration of antibodies against Chlamydia psittaci and Coxiella burnetii in dogs and cats: comparison of the enzyme immunoassay, immunoperoxidase technic, complement fixation test and agar gel precipitation test. Zentralbl Veterinarmed B 34(3):165-176