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| '''For patient information click [[{{PAGENAME}} (patient information)|here]]'''
| | #Redirect[[Pneumocystis jirovecii pneumonia]] |
| {{DiseaseDisorder infobox |
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| Name = Pneumocystis jirovecii pneumonia |
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| ICD10 = {{ICD10|B|20|6|b|20}} |
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| ICD9 = {{ICD9|136.3}} |
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| ICDO = |
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| Image = Pneumocystis.jpg |
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| Caption = '''''Pneumocystis jirovecii''''' cysts from bronchoalveolar lavage, stained with [[Toluidin blue O stain]] |
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| OMIM = |
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| OMIM_mult = |
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| MedlinePlus = 000671 |
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| eMedicineSubj = |
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| eMedicineTopic = |
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| DiseasesDB = 10160 |
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| MeshID = D011020 |
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| }}
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| {{Search infobox}}
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| {{CMG}}
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| ==Overview==
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| '''''Pneumocystis'' pneumonia''' ('''PCP''') is a form of [[pneumonia]] caused by the yeast-like [[fungus|fungal]] ''Pneumocystis jirovecii'' (Jirovecii is pronounced "yee row vet zee eye"). The causal agent was originally described as a protozoan and spelled ''P. jiroveci'' and prior to then was classified as a form of ''Pneumocystis carinii'', a name still in common usage.<ref name=Stringer_2002>{{cite journal | author=Stringer JR, Beard CB, Miller RF, Wakefield AE | title=A new name (''Pneumocystis jiroveci'') for ''Pneumocystis'' from humans | journal=Emerg Infect Dis | year=2002 | pages=891-6 | volume=8 | issue=9 | id=PMID 12194762}}</ref><ref name=Redhead_2006>{{cite journal | author=Redhead SA, Cushion MT, Frenkel JK, Stringer JR | title=''Pneumocystis'' and ''Trypanosoma cruzi'': nomenclature and typifications | journal=J Eukaryot Microbiol | year=2006 | pages=2–11 | volume=53 | issue=1 | id=PMID 16441572}}</ref> These names are discussed below. As a result, '''Pneumocystis pneumonia (PCP)''' has also been known as '''Pneumocystis jiroveci[i] pneumonia''' and as '''Pneumocystis carinii pneumonia''', as is also explained below.<ref name=Cushion_1998>{{cite journal | author=Cushion MT .| title = Chapter 34. ''Pneumocystis carinii''. In: Collier, L., Balows, A. & Sussman, M. (ed.), Topley and Wilson's Microbiology and Microbial Infections 9th ed. Arnold and Oxford Press, New York. | year = 1998 | pages = 645–683}}</ref><ref name=Cushion_1998b>{{cite journal | author=Cushion MT | title = Taxonomy, genetic organization, and life cycle of ''Pneumocystis carinii'' | | journal = Semin. Respir. Infect | year = 1998 | volume = 13 | issue =4 | pages = 304–312}}</ref><ref name=Cushion_2004>{{cite journal | author=Cushion MT | title = ''Pneumocystis'': unraveling the cloak of obscurity | | journal = Trends Microbiol | year = 2004 | volume = 12 | issue =5 | pages = 243–249}}</ref>
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| It is relatively rare in people with normal immune systems but common among people with
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| weakened [[immune system]]s, such as premature or severely malnourished children, the elderly, and especially [[AIDS]] patients, in whom it is most commonly observed today.<ref name=Sherris>{{cite book | author = Ryan KJ; Ray CG (editors) | title = Sherris Medical Microbiology | edition = 4th ed. | publisher = McGraw Hill | year = 2004 | id = ISBN 0838585299 }}</ref> PCP can also develop in patients who are taking [[Immunosuppressive drug|immunosuppressant medications]] (e.g. patients who have undergone [[Organ transplant|solid organ transplantation]]) and in patients who have undergone [[bone marrow transplantation]].
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| The organism is distributed worldwide<ref name=Morris_2004>{{cite journal | author=Morris A et al | title= Current Epidemiology of Pneumocystis Pneumonia | journal=Emerg Infect Dis | year=2004 | pages=1713-1720 | volume=10 | issue=10 | id=PMID 15504255}}</ref>[http://www.cdc.gov/ncidod/eid/vol10no10/03-0985.htm].
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| ==Epidemiology==
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| Pneumocystis pneumonia has been described in all continents except Antarctica.<ref name=Morris_2004/> It was originally described as a rare cause of [[pneumonia]] in [[neonate]]s. It is believed to be an environmental organism, and human-to-human transmission is thought not to occur (although in one outbreak of 12 cases among transplant patients in Leiden it was postulated, but not proven, that human-to-human spread may have occurred).<ref>{{cite journal | author=de Boer M, Bruijnesteijn van Coppenraet L, Gaasbeek A, ''et al.'' | title=An outbreak of Pneumocystis jiroveci pneumonia with 1 predominant [[genotype]]
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| among renal transplant recipients: interhuman transmission or a common environmental source? | journal=Clin Infect Dis |year=2007 | volume=44 | issue=9 | pages=1143–49 | id=PMID 17407029 }}</ref> Greater than 75% of children are seropositive by the age of 4, which suggest a high background exposure to the organism.
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| Since the start of the [[HIV]] pandemic, PCP has been closely associated with AIDS. Because it only occurs in an immunocompromised host, it may be the first clue to a new AIDS diagnosis if the patient has no other reason to be immunocompromised (e.g. taking immunosuppressive drugs for [[organ transplant]]). An unusual rise in the number of PCP cases in North America, noticed when physicians began requesting large quantities of the rarely used antibiotic [[pentamidine]], was the first clue to the existence of AIDS in the early 1980s.<ref>{{cite journal | title=A Cluster of Kaposi's Sarcoma and ''Pneumocystis carinii'' pneumonia among homosexual male residents of Los Angeles and Range Counties, California | author=Fannin S, Gottlieb MS, Weisman JD, ''et al.'' | year=1982 | journal=MMWR Weekly | volume=31 | issue=32 | pages=305–7 }}</ref><ref>{{cite journal | author=Masur H, Michelis MA, Greene JB, ''et al.'' |title=An outbreak of community-acquired Pneumocystis carinii pneumonia |journal=N Engl J Med |year=1981 |volume=305 |pages=1431–8 | url=http://www.cdc.gov/mmwr/preview/mmwrhtml/00001114.htm }}</ref>
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| Prior to the development of more effective treatments, PCP was a common and rapid cause of death in persons living with AIDS. Much of the incidence of PCP has been reduced by instituting a standard practice of using oral [[co-trimoxazole]] to prevent the disease in people with [[CD4]] counts less than 200/mm³. In populations that do not have access to preventative treatment, PCP continues to be a major cause of death in AIDS.
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| In [[immunocompromised]] patients (e.g. cancer patients on [[chemotherapy]], or persons living with [[AIDS]] with a [[T helper cell|CD4+ T-cell]] count below 200/μl), [[prophylaxis]] with regular [[pentamidine]] inhalations or [[sulfamethoxazole]]/[[trimethoprim]] ([[co-trimoxazole]] or [[TMP-SMX]]) may be necessary to prevent PCP.
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| ==Symptoms==
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| ==Pathophysiology==
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| ==Diagnosis==
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| The diagnosis can be confirmed by the characteristic appearance of the [[chest x-ray]] which shows widespread pulmonary infiltrates, and an [[arterial blood gas|arterial oxygen level]] (pO<sub>2</sub>) strikingly lower than would be expected from symptoms. The diagnosis can be definitively confirmed by pathologic identification of the causative organism in induced [[sputum]] or [[bronchia]]l washings obtained by [[bronchoscopy]] with coloration by [[toluidine blue]] or [[immunofluorescence assay]], which will show characteristic [[cyst]]s [http://www.bmb.leeds.ac.uk/mbiology/ug/ugteach/icu8/std/pcp.html].
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| ''Pneumocystis'' infection can also be diagnosed by [[immunofluorescent]] or [[histochemical staining]] of the specimen, and more recently by molecular analysis of [[PCR]] products comparing [[DNA]] samples. Notably, simple molecular detection of ''Pneumocystis jirovecii'' in lung fluids does not mean that a person has Pneumocystis pneumonia or infection by [[HIV]]. The fungus appears to be present in healthy individuals also in the general population.<ref name=Medrano_2005>{{cite journal | author=Medrano FJ et al | title= ''Pneumocystis jiroveci''i in General Population | journal=Emerg Infect Dis | year=2005 | pages=245–250 | volume=11 | issue=2 | id=PMID 15752442 }}</ref>
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| [[Image:PCPxray.jpg|thumb|left|250px|'''X-ray of Pneumocystis jirovecii pneumonia''' There is increased white (opacity) in the lower lungs on both sides, characteristic of ''Pneumocystis'' pneumonia]]
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| ==Life-cycle==
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| ==Treatment==
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| ==Guidelines==
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| To read about guidelines for prevention and treatment of Pneumocystis pneumonia Infections in HIV-Infected Adults and Adolescents, click [[HIV opportunistic infection pneumocystis pneumonia: prevention and treatment guidelines|'''here''']].
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| ==References==
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| {{Reflist|2}}
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| {{Mycoses}}
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| [[de:Pneumocystis jiroveci]]
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| [[es:Pneumocystis jiroveci]]
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| [[fr:Pneumocystose]]
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| [[fr:Pneumocystis jiroveci]]
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| [[ja:ニューモシスチス肺炎]]
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| [[pt:Pneumocistose]]
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| [[pl:Pneumocystis jiroveci]]
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| [[Category:Fungal diseases]]
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| [[Category:Ascomycota]]
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| [[Category:Infectious disease]]
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| [[Category:Overview complete]]
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