Chlamydophila pecorum

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A Microbial Biorealm page on the genus Chlamydophila pecorum


Higher order taxa

Domain: Bacteria; Phylum: Chlamydiae; Class: Chlamydiales; Order:Chlamydiaceae; Family: Chlamydophila; Genus: Chlamydophila


NCBI: Taxonomy

Genus species: Chlamydophila pecorum

Description and significance

Describe the appearance, habitat, etc. of the organism, and why it is important enough to have its genome sequenced. Describe how and where it was isolated. Include a picture or two (with sources) if you can find them.

Genome structure

Describe the size and content of the genome. How many chromosomes? Circular or linear? Other interesting features? What is known about its sequence? Does it have any plasmids? Are they important to the organism's lifestyle?

Cell structure and metabolism

Describe any interesting features and/or cell structures; how it gains energy; what important molecules it produces.


Describe any interactions with other organisms (included eukaryotes), contributions to the environment, effect on environment, etc.


Chlamydophila pecorum is pathogenic and is highly adapted for infection within certain mammalian host. Its mechanism of infecting the host is termed the developmental cycle, which consists of infection, growth, maturation, release and reinfection. They cycle begins with the elementary bodies (EB) attaching into the host cells. The EB are small, rigid particles that are osmotically stable, but metabolically inert and thus unable to grow and divide. They also exist in the extracellular environment until a host cell is available for intracellular growth. After its entry into the host cell, EB converts to reticulate body (RB) that grow and divide by binary fission with the inclusion, which are intracellular, membrane enclosed organelle that help the growth of Chlamydophila pecorum. RBs are larger, osmotically unstable and unable to attach to the host cell so they are not infectious. RB eventually converts back to infectious EB in order to release EB into the environment and infect other neighboring host cells.

C.pecorum is found mostly in mammals like cattle, sheep, goats, koalas and swine. In koala, it causes urinary tract disease, infertility, and reproductive diseases. In other mammals, it is associated with abortion, conjunctivitis, encephalomyelitis, pneumonia, polyarthritis and enteritis. Symptoms are either absent or indolent so it is hard to diagnose. There is no evidence yet that C.pecorum can be transmitted from animals to humans.

Application to Biotechnology

Does this organism produce any useful compounds or enzymes? What are they and how are they used?

Current Research

Enter summaries of the most recent research here--at least three required


[Sample reference] Takai, K., Sugai, A., Itoh, T., and Horikoshi, K. "Palaeococcus ferrophilus gen. nov., sp. nov., a barophilic, hyperthermophilic archaeon from a deep-sea hydrothermal vent chimney". International Journal of Systematic and Evolutionary Microbiology. 2000. Volume 50. p. 489-500.

Edited by student of Rachel Larsen