Chlamydophila psittaci

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Related to Chlamydophila psittaci: C. psittaci

Chla·myd·o·phil·a psit·ta·ci

(klă-midō-filă si-tasī)
Organisms that resemble C. trachomatis but do not produce glycogen. Various strains of this species cause psittacosis in humans and ornithosis in birds. Also called Chlamydia psittaci (q.v.).

Chlamydophila psittaci

A species of Chlamydophila common in birds and animals. Pet owners, pet shop employees, poultry workers, and workers in meat-processing plants are frequently exposed to C. psittaci.


After an incubation period of 5 to 15 days, nonspecific symptoms (e.g., malaise, headache, fever) develop; progression to pneumonia is serious and may be fatal. Alternatively, the disease may resemble infectious mononucleosis with fever, pharyngitis, hepatosplenomegaly, and adenopathy. Severity may vary from inapparent to mild to fatal systemic disease.


The fatality rate is approx. 20% in untreated patients.


Treatment consists of tetracycline or doxycycline for 10 to 21 days.

See also: Chlamydophila


a genus of obligately intracellular bacteria in the family Chlamydiaceae. Members were previously in the genus Chlamydia.

Chlamydophila abortus
causes enzootic abortion of ewes. Previously called Chlamydia psittaci.
Chlamydophila caviae
causes conjunctivitis in guinea pigs. Previously called Chlamydia psittaci.
Chlamydophila felis
cause of upper respiratory tract disease, principally involving conjunctivitis, in cats. Also recovered from the reproductive tract, where its pathogenic significance is uncertain. Previously called Chlamydia psittaci.
Chlamydophila pecorum
causes sporadic bovine encephalomyelitis, but also associated with enteritis, polyarthritis, pneumonia and conjunctivitis in ruminants, and reproductive tract disease in koalas. Previously classified as Chlamydia psittaci and C. pecorum. Conjunctivitis in sheep previously attributed to Colesiota conjunctivae.
Chlamydophila pneumoniae
different biovars infect horses, koalas and humans. Pathogenic significance in koalas and horses is uncertain, but in humans it is a significant cause of pneumonia. Previously classified as Chlamydia psittaci and C. pneumoniae.
Chlamydophila psittaci
cause of psittacosis and ornithosis, systemic disease of psittacine and other avian species, including domestic poultry. Zoonotic. Previously called Chlamydia psittaci.
References in periodicals archive ?
Chlamydophila psittaci was detected in 10% of 431 fulmars examined from the Faroe Islands.
We defined a probable case of disease as psittacosis in a suspected case-patient in which any of the following were demonstrated: seroconversion, a 4-fold rise in immunoglobulin (1g) G titer by microimmunofluorescence (MIF), or a single or static high convalescent-phase MIF IgG titer to Chlamydophila psittaci.
3,9-12) Chlamydophila psittaci can infect people and cause flu-like symptoms, pneumonia, and, rarely, death.
Chlamydophila psittaci occurs worldwide, and multiple chlamydial disease outbreaks have been reported in commercial, pet, and wild birds.
This leads to the hypothesis that pigeons act as asymptomatic reservoirs of Chlamydophila psittaci and Campylobacter jejuni.
Another potential pathogen sometimes found in bird (but not bat) droppings is a bacterium called Chlamydophila psittaci (formerly Chlamydia psittaci), the causal agent of psittacosis, or parrot fever.
Two weeks before the start of the study, physical examinations were performed, and the parrots were tested by polymerase chain reaction analysis for the presence of psittacine circovirus (blood sample) and Chlamydophila psittaci (choanal and cloacal swab and blood samples).
Sequencing of the Chlamydophila psittaci ompA gene reveals a new genotype, E/B, and the need for a rapid discriminatory genotyping method.
Evaluation of Chlamydophila psittaci infection and other risk factors for atherosclerosis in pet psittacine birds.
39) Also, a dose of 40 mg/kg given every 48 hours was found to maintain therapeutic blood concentrations in blue and gold macaws (Ara ararauna) and to be effective at eliminating Chlamydophila psittaci infections in cockatiels (Nymphicus hollandicus).