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File:Free-living amebic infections.png

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Free-living_amebic_infections.png(518 × 435 pixels, file size: 31 KB, MIME type: image/png)
Description
English: This is an illustration of the life cycle of the parasitic agents responsible for causing “free-living” amebic infections.

For a complete description of the life cycle of these parasites, select the link below the image or paste the following address in your address bar: http://www.dpd.cdc.gov/dpdx/HTML/FreeLivingAmebic.htm Free-living amebae belonging to the genera en:Acanthamoeba, en:Balamuthia, and en:Naegleria are important causes of disease in humans and animals. en:Naegleria fowleri produces an acute, and usually lethal, central nervous system (CNS) disease called en:primary amebic meningoencephalitis (PAM). N. fowleri has three stages, cysts (1) , en:trophozoites (2) , and flagellated forms (3) , in its life cycle. The trophozoites replicate by en:promitosis (nuclear membrane remains intact) (4) . Naegleria fowleri is found in fresh water, soil, thermal discharges of power plants, heated swimming pools, hydrotherapy and medicinal pools, aquariums, and sewage. Trophozoites can turn into temporary flagellated forms which usually revert back to the trophozoite stage. Trophozoites infect humans or animals by entering the olfactory neuroepithelium (5) and reaching the brain. N. fowleri trophozoites are found in cerebrospinal fluid (CSF) and tissue, while flagellated forms are found in CSF.

Acanthamoeba spp. and Balamuthia en:mandrillaris are opportunistic free-living amebae capable of causing en:granulomatous amebic encephalitis (GAE) in individuals with compromised immune systems. Acanthamoeba spp. have been found in soil; fresh, brackish, and sea water; sewage; swimming pools; contact lens equipment; medicinal pools; dental treatment units; dialysis machines; heating, ventilating, and air conditioning systems; mammalian cell cultures; vegetables; human nostrils and throats; and human and animal brain, skin, and lung tissues. B. mandrillaris however, has not been isolated from the environment but has been isolated from autopsy specimens of infected humans and animals. Unlike N. fowleri, Acanthamoeba and Balamuthia have only two stages, cysts (1) and trophozoites (2) , in their life cycle. No flagellated stage exists as part of the life cycle. The trophozoites replicate by en:mitosis (nuclear membrane does not remain intact) (3) . The trophozoites are the infective forms and are believed to gain entry into the body through the lower respiratory tract, ulcerated or broken skin and invade the central nervous system by hematogenous dissemination (4). Acanthamoeba spp. and Balamuthia mandrillaris cysts and trophozoites are found in tissue.
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This media comes from the Centers for Disease Control and Prevention's Public Health Image Library (PHIL), with identification number #3412. Note: Not all PHIL images are public domain; be sure to check copyright status and credit authors and content providers.

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  • Content Providers(s): CDC/Alexander J. da Silva, PhD/Melanie Moser
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English: None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.
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This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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The original description page was here. All following user names refer to en.wikipedia.
  • 2006-05-04 01:09 Keenan Pepper 518×435×8 (31658 bytes) Free-living_amebic_infections.gif, converted to [[PNG]] by [[netpbm]].

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current06:30, 20 July 2008Thumbnail for version as of 06:30, 20 July 2008518 × 435 (31 KB)Optigan13{{Information |Description={{en|This is an illustration of the life cycle of the parasitic agents responsible for causing “free-living” amebic infections. For a complete description of the life cycle of these parasites, select the link below the image
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