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A bacterial genus with a complex obligatory intracellular life cycle; the infective form is the elementary body that penetrates the host cell, replicating as the rediculate body by binary fission; replication occurs in a vacuole called the inclusion body; lacking peptidoglycan in cell walls. Conditions associated with Chlamydophila include pneumonitis in cattle, sheep, swine, cats, goats, and horses; bovine sporadic encephalomyelitis, enteritis of calves; (C. pneumoniae, C. pecorum subtypes); enzootic abortion of ewes (C. abortus); also affecting cats (C. felis); guinea pigs (C. caviae), and C. psittaci, the agent of psittacosis/ornithosis in psittacine and nonpsittacine birds.
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(kla-mid-ō-fil'ă, klă-midō-filă)
A newly named genus in the family Chlamydiaceae, including species formerly assigned to the genus Chlamydia.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(kla-mi-dof'i-la) [Gr. chlamys, cloak + ?]
A bacterial genus of intracellular parasites of the family Chlamydiaceae, comprising six species, of which C. pneumoniae and C. psittaci infect humans. The organisms are characterized as bacteria because of the composition of their cell walls and their reproduction by binary fission, but they reproduce only within cells. These species cause a variety of diseases. See: Chlamydia

Chlamydophila pneumoniae

A species of Chlamydophila that is an important cause of pneumonia, bronchitis, and sinusitis. It is believed to be transmitted from person to person by respiratory tract secretions (e.g., by airborne droplets). Most cases are mild and rarely require hospitalization. It is possible that this organism is a factor in the development of coronary artery disease.


Treatment consists of daily tetracycline, macrolide, or fluoroquinolone for 14 to 21 days.

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.

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References in periodicals archive ?
Chlamydophila pneumoniae Infection and Its Role in Neurological Disorders.
Variable association between Chlamydophila psittaci infection and ocular adnexal lymphomas: methodological biases or true geographical variations?
Detection and characterization of Chlamydophila psittaci in asymptomatic feral pigeons (Columba livia domestica) in central Thailand.
This panel of tests from the Animal Health Diagnostic Center at Cornell School of Veterinary Medicine costs $311 and includes an aerobic bacterial culture and sensitivity, cytology, virus isolation, and testing for chlamydophila, calicivirus, feline herpesvirus, panleukopenia, and mycoplasma.
Group A [beta]-hemolytic streptococcus and Chlamydophila pneumoniae, bacteria causing upper respiratory tract infections, may cause ReA as well [7].
The detection of Chlamydophila psittaci genotype C infection in dogs.
Psittacosis or parrot fever is a disease caused by Chlamydophila psittaci, a Gram-negative coccus and obligate intracellular bacteria [9] and has been reported to be most common in orders Psittaciformes and Columbiformes.
Community-acquired pneumonia by Chlamydophila pneumoniae : A clinical and incidence study in Brazil.
Screening IgM and IgG antibodies to chlamydophila pneumoniae by enzyme immunoassay (EIA) in paediatric LRTIs in a tertiary hospital experience in Koshi area (Northern Bihar), India.
pneumoniae, Chlamydia (Chlamydophila) pneumoniae, and Legionella spp., with human ribonuclease P gene serving as an internal control, as previously described (17).