chlamydia pecorum chlamydia pecorum chlamydia pecorum, also known as chlamydophila pecorum is a species of chlamydiaceae that originated from ruminants, such as cattle, sheep and goats. it has also infected koalas and swine. c. pecorum strains are serologically and pathogenically diverse. chlamydia pecorum scientific classification domain: bacteria phylum: chlamydiota class: chlamydiia order: chlamydiales family: chlamydiaceae genus: chlamydia species: c. pecorum binomial name chlamydia pecorumfukushi & hirai 1992 synonyms chlamydophila pecora corrig. (fukushi & hirai 1992) everett et al. 1999 in the koalas, c. pecorum causes infections in the reproductive systems and urinary tract, as well as pneumonia, infertility, and death. it is considered one of the most important infectious diseases that currently plagues koalas. c.pecorum is the most common chlamydial species to infect koalas and is the most pathogenic. in other animals, c. pecorum has been associated with abortion, conjunctivitis, encephalomyelitis, enteritis, arthritis, and polyarthritis.