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Chlamydia pneumoniae is a species of chlamydiae bacteria that infects humans and is a major cause of pneumonia. Chlamydia pneumoniae has a complex life cycle and must infect another cell in order to reproduce and thus is classified as an obligate intracellular pathogen. In addition to its role in pneumonia, there is evidence associating Chlamydia pneumoniae with atherosclerosis and with asthma. The full genome sequence for Chlamydia pneumoniae was published in 1999.
Chlamydia pneumoniae also infects and causes disease in Koalas, emerald tree boa (Corallus caninus), iguanas, chameleons, frogs, and turtles.
The first known case of infection with C. pneumoniae was a case of sinusitis in Taiwan.
This atypical bacterium commonly causes pharyngitis, bronchitis and atypical pneumonia1 mainly in elderly and debilitated patients but in healthy adults also.2
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Life cycle and method of infection
Chlamydia pneumoniae is a small bacterium (0.2 to 1 micrometer) that undergoes several transformations during its life cycle. It exists as an elementary body (EB) in between hosts. The EB is not biologically active but is resistant to environmental stresses and can survive outside of a host for a limited time. The EB travels from an infected person to the lungs of a non-infected person in small droplets and is responsible for infection. Once in the lungs, the EB is taken up by cells in a pouch called an endosome by a process called phagocytosis. However, the EB is not destroyed by fusion with lysosomes as is typical for phagocytosed material. Instead, it transforms into a reticulate body and begins to replicate within the endosome. The reticulate bodies must utilize some of the host's cellular machinery to complete its replication. The reticulate bodies then convert back to elementary bodies and are released back into the lung, often after causing the death of the host cell. The EBs are thereafter able to infect new cells, either in the same organism or in a new host. Thus, the life cycle of Chlamydia pneumoniae is divided between the elementary body which is able to infect new hosts but can not replicate and the reticulate body which replicates but is not able to cause new infection.
Pneumonia caused by Chlamydia pneumoniae
Chlamydia pneumoniae is a common cause of pneumonia around the world. Chlamydia pneumoniae is typically acquired by otherwise healthy people and is a form of community-acquired pneumonia. Because treatment and diagnosis are different from historically recognized causes such as Streptococcus pneumoniae, pneumonia caused by Chlamydia pneumoniae is categorized as an "atypical pneumonia."
Symptoms and diagnosis
Symptoms of infection with Chlamydia pneumoniae are indistinguishable from other causes of pneumonia. These include cough, fever, and difficulties breathing. Chlamydia pneumoniae more often causes pharyngitis, laryngitis, and sinusitis than other causes of pneumonia; however, because many other causes of pneumonia results in these symptoms, differentiation is not possible. Likewise, a physical examination by a health provider does not typically provide information which allows for a definite diagnosis.
Diagnosis of Chlamydia pneumoniae may be confounded by prior infections with this microorganism. Examination of sputum or the secretions of the respiratory tract may reveal signs of the bacteria. Otherwise, examination of the blood may reveal antibodies against the bacteria. Interpretation may require a period of six weeks in order to reanalyze the antibodies and to determine whether the infection was new or old. Examination of the blood may also show proteins (antigens) from Chlamydia pneumoniae, either through direct fluorescent antibody testing, enzyme-linked immunosorbent assay (ELISA), or polymerase chain reaction (PCR).
Chest x-rays of lungs infected with Chlamydia pneumoniae often show a small patch of increased shadow (opacity). However, many different patterns are common and there is no appearance which allows for a specific diagnosis.
Treatment and prognosis
Typically, treatment for pneumonia is begun before the causative microorganism is identified. This empiric therapy includes an antibiotic active against the atypical bacteria, including Chlamydia pneumoniae. The most common type of antibiotic used is a macrolide such as azithromycin or clarithromycin. If testing reveals that Chlamydia pneumoniae is the causative agent, therapy may be switched to doxycycline, which is slightly more effective against the bacteria. Sometimes a quinolone antibiotic such as levofloxacin may be started empirically. This group is not as effective against Chlamydia pneumoniae. Treatment is typically continued for ten to fourteen days for known infections.
Prognosis of pneumonia caused by Chlamydia pneumoniae is excellent. Hospitalization is uncommon, complications are rare, and most people have no residual deficits. In fact, Chlamydia pneumoniae is a common cause of walking pneumonia, so named because most people are able to continue to walk and participate in reduced activity during infection.
Epidemiology and prevention
Chlamydia pneumoniae affects all age groups and is most common among the 60-79 year old age group. Reinfection is common after a short period of immunity. The incidence is one case out of one thousand per year and causes ten percent of community-acquired pneumonias treated without hospitalization.citation needed As of 2005, there are no vaccines or other ways to prevent infection other than good hygiene.
Other illnesses caused by Chlamydia pneumoniae
In addition to pneumonia, Chlamydia pneumoniae less commonly causes several other illnesses. Among these are meningoencephalitis (infection and inflammation of the brain and spinal cord), arthritis, myocarditis (inflammation of the heart), and Guillain-Barré syndrome (inflammation of the nerves). It has also been associated with dozens of other conditions, such as Alzheimer's disease, Fibromyalgia, Chronic Fatigue Syndrome, Prostatitis, and many others.
Links between Chlamydia pneumoniae and chronic inflammatory diseases
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In addition to acute infections already covered, Chlamydia pneumoniae has been implicated in several chronic diseases. There is evidence that the onset of asthma, a chronic inflammatory disease of the lungs, is associated with infection with Chlamydia pneumoniae.citation needed Some patients have had amazing recoveries from lifelong asthma as the result of being prescribed anti-chlamydial antibiotics.citation needed However, not all asthma results from infection with chlamydia pneumoniae, and research is ongoing.
Links between infection with Chlamydia pneumoniae heart attacks (myocardial infarction) and atherosclerosis have also been found.3 In fact, Chlamydia pneumoniae has been found within plaques in the walls of coronary arteries supplying the heart.45 Antibody levels against Chlamydia pneumoniae are also higher in people with heart problems.6 As of 2005, short-term prescription of anti-chlamydial antibiotics has not been shown to decrease incidence of myocardial infarction.7 Such treatment is experimental, although research from Vanderbilt as early as the mid 1990s found that Chlamydia pneumoniae had a role in many chronic inflammatory diseasescitation needed and that multi-antibiotic protocols could be helpful, or even 'cure' some individuals with conditions such as Chronic Fatigue Syndrome."Chlamydia pneumoniae in Chronic Fatigue Syndrome and Fibromyalgia - An Opinion". Retrieved on 2008-08-24.
Chlamydia pneumoniae has also been found in the cerebrospinal fluid of some patients diagnosed with multiple sclerosis,8 a controversial finding, but pilot data suggests that antibiotic treatment of MS results in improvements, sometimes dramatic, in such cases."Empirical antibacterial treatment of infection with Chlamydophila pneumoniae in Multiple Sclerosis". Retrieved on 2008-08-08. A range of other inflammatory conditions are hypothesized to be linked with infection with chlamydial pneumonaie, including fibromyalgia, chronic fatigue syndrome, intercystial cystitis and prostatitis, as well as many others."Breaking Research Reveals Common Bacterium Chlamydia Pneumoniae may be Culprit in CFIDS, FMS and MS". Retrieved on 2008-08-01.
References
- ^ Lang, B. R., Chlamydia pneumonia as a differential diagnosis? Follow-up to a case report on progressive pneumonitis in an adolescent, Patient Care, Sept. 15, 1991
- ^ Little, Linda, Elusive pneumonia strain frustrates many clinicians, Medical Tribune, p. 6, September 19, 1991
- ^ Blasi F, Denti F, Erba M, et al (November 1996). "Detection of Chlamydia pneumoniae but not Helicobacter pylori in atherosclerotic plaques of aortic aneurysms". J. Clin. Microbiol. 34 (11): 2766–9. PMID 8897180. PMC: 229401, http://jcm.asm.org/cgi/pmidlookup?view=long&pmid=8897180.
- ^ Ramirez JA (December 1996). "Isolation of Chlamydia pneumoniae from the coronary artery of a patient with coronary atherosclerosis. The Chlamydia pneumoniae/Atherosclerosis Study Group". Ann. Intern. Med. 125 (12): 979–82. PMID 8967709, http://www.annals.org/cgi/pmidlookup?view=long&pmid=8967709.
- ^ Jackson LA, Campbell LA, Kuo CC, Rodriguez DI, Lee A, Grayston JT (July 1997). "Isolation of Chlamydia pneumoniae from a carotid endarterectomy specimen". J. Infect. Dis. 176 (1): 292–5. PMID 9207386.
- ^ Danesh J, Collins R, Peto R (1997). "Chronic infections and coronary heart disease: is there a link?". Lancet 350 (9075): 430–6. doi:. PMID 9259669.
- ^ M Stitzinger (2007). "Lipids, inflammation and atherosclerosis" (pdf). The digital repository of Leiden University. Retrieved on 2007-11-02. "Results of clinical trials investigating anti-chlamydial antibiotics as an addition to standard therapy in patients with coronary artery disease have been inconsistent. Therefore, Andraws et al conducted a meta- analysis of these clinical trials and found that evidence available to date does not demonstrate an overall benefit of antibiotic therapy in reducing mortality or cardiovascular events in patients with coronary artery disease."
- ^ Sriram S, Stratton CW, Yao S, et al (1999). "Chlamydia pneumoniae infection of the central nervous system in multiple sclerosis". Ann. Neurol. 46 (1): 6–14. doi:. PMID 10401775.
- Bodetti TJ, Jacobson E, Wan C, et al (April 2002). "Molecular evidence to support the expansion of the hostrange of Chlamydophila pneumoniae to include reptiles as well as humans, horses, koalas and amphibians". Syst. Appl. Microbiol. 25 (1): 146–52. doi:. PMID 12086181.
- Cannon CP, Braunwald E, McCabe CH, et al (April 2005). "Antibiotic treatment of Chlamydia pneumoniae after acute coronary syndrome". N. Engl. J. Med. 352 (16): 1646–54. doi:. PMID 15843667.
- Hahn DL, Dodge RW, Golubjatnikov R (July 1991). "Association of Chlamydia pneumoniae (strain TWAR) infection with wheezing, asthmatic bronchitis, and adult-onset asthma". JAMA 266 (2): 225–30. doi:. PMID 2056624.
- Jacobson ER, Heard D, Andersen A (March 2004). "Identification of Chlamydophila pneumoniae in an emerald tree boa, Corallus caninus". J. Vet. Diagn. Invest. 16 (2): 153–4. PMID 15053368, http://www.jvdi.org/cgi/pmidlookup?view=long&pmid=15053368.
- Kalman S, Mitchell W, Marathe R, et al (April 1999). "Comparative genomes of Chlamydia pneumoniae and C. trachomatis". Nat. Genet. 21 (4): 385–9. doi:. PMID 10192388.
- Mattson MP (January 2004). "Infectious agents and age-related neurodegenerative disorders". Ageing Res. Rev. 3 (1): 105–20. doi:. PMID 15163105.
- O'Connor S, Taylor C, Campbell LA, Epstein S, Libby P (2001). "Potential infectious etiologies of atherosclerosis: a multifactorial perspective". Emerging Infect. Dis. 7 (5): 780–8. PMID 11747688, http://www.cdc.gov/ncidod/eid/vol7no5/oconnor.htm.
- Storey C, Lusher M, Yates P, Richmond S (November 1993). "Evidence for Chlamydia pneumoniae of non-human origin". J. Gen. Microbiol. 139 (11): 2621–6. PMID 8277245.
- Thomas NS, Lusher M, Storey CC, Clarke IN (June 1997). "Plasmid diversity in Chlamydia". Microbiology (Reading, Engl.) 143 ( Pt 6): 1847–54. PMID 9202459, http://mic.sgmjournals.org/cgi/pmidlookup?view=reprint&pmid=9202459.
External links
- http://cpnhelp.org CPNhelp.org, A Clearinghouse for Information on Treatment of CPn Infections, especially those believed to be associated with chronic and disabling diseases such as MS and Chronic Fatigue Syndrome. Includes dozens of scientific papers, input from physicians who treat CPn infections, links to patents, and a forum to communicate with patients currently going through treatment of CPn infection through multi-antibiotic protocols.
- http://fpnotebook.com/LUN24.htm "Family Practice Notebook" page on Chlamydia pneumoniae
- Abstract by Nancy Humphrey
- Kuoppa Y, Boman J, Scott L, Kumlin U, Eriksson I, Allard A (June 2002). "Quantitative detection of respiratory Chlamydia pneumoniae infection by real-time PCR". J. Clin. Microbiol. 40 (6): 2273–4. doi:. PMID 12037108. PMC: 130697, http://jcm.asm.org/cgi/pmidlookup?view=long&pmid=12037108.
- Kuo CC, Jackson LA, Campbell LA, Grayston JT (October 1995). "Chlamydia pneumoniae (TWAR)". Clin. Microbiol. Rev. 8 (4): 451–61. PMID 8665464. PMC: 172870, http://cmr.asm.org/cgi/pmidlookup?view=long&pmid=8665464.
- Barut A, Inal A, Demiröz P, Hacibektaşoğlu A (April 1991). "[A new respiratory tract pathogen]" (in Turkish). Mikrobiyol Bul 25 (2): 194–205. PMID 1745154.
- Grayston JT, Kuo CC, Wang SP, Altman J (July 1986). "A new Chlamydia psittaci strain, TWAR, isolated in acute respiratory tract infections". N. Engl. J. Med. 315 (3): 161–8. PMID 3724806.
- Falck G, Heyman L, Gnarpe J, Gnarpe H (1994). "Chlamydia pneumoniae (TWAR): a common agent in acute bronchitis". Scand. J. Infect. Dis. 26 (2): 179–87. doi:. PMID 8036474.
- AsthmaStory.com
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