Acanthamoeba


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Acanthamoeba

 [ah-kan″thah-me´bah]
a genus of free-living ameboid protozoa found usually in fresh water or moist soil. Certain species, such as A. castella´ni, A. poly´phaga, A. astronyx´is, and A. culbert´soni, may occur as opportunistic human pathogens, causing an acute fatal or chronic infection of the eye, brain, liver, kidney, lung, pancreas, and skin in patients with underlying disease or in immunocompromised patients.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

Acanthamoeba

(ă-kan'thă-mē'bă),
A genus of free-living ameba (family Acanthamoebidae, order Amoebida) found in and characterized by the presence of acanthopodia. Human infection includes invasion of skin or colonization following injury, corneal invasion and colonization, and possibly lung or genitourinary tract colonization; a few cases of brain or central nervous system invasion have occurred, but not solely by the olfactory epithelium route of entry as with the more virulent infections caused by Naegleria fowleri. Species responsible are chiefly Acanthamoeba culbertsoni, but cases have been reported involving Acanthamoeba castellanii, Acanthamoeba polyphaga, and Acanthamoeba astronyxis. Most cases have been chronic rather than fulminating and rapidly fatal as with N. fowleri infection.
[G. akantha, thorn, spine, + Mod. L. amoeba, fr. G. amoibē, change]
Farlex Partner Medical Dictionary © Farlex 2012

Acanthamoeba

A genus of free-living pathogenic amoebae, which are ubiquitous in the environment, the cycle of which consists of 2 stages: a trophozoite (which is 14–40 µm in diameter) and a cyst (which has a double-layered wall with a diameter of 12–16 µm).

Sources
Tap water, dust, soil, sewage, air-conditioning units.
 
Diseases caused by:
Amoebic keratitis, acanthamoeba granulomatous encephalitis.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Acanthamoeba

A genus of free-living pathogenic amoebas Sources tap water, dust, soil, sewage, air conditioning units. See Acanthamebiasis. Cf Leptomyxid, Naegleria.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
de Freitas, "Serine-like proteolytic enzymes correlated with differential pathogenicity in patients with acute Acanthamoeba keratitis," Clinical Microbiology and Infection, vol.
Acanthamoeba is abundant in tap water as well as rivers, ponds and lakes.
With the Acanthamoeba parasite also found in dust, sea, showers and swimming pools, millions of people are at risk of going blind worldwide.
The granulomatous nature of the lesion also raised the possibility of granulomatous amoebic encephalitis due to Acanthamoeba species.
Ophthalmic examination revealed a prominent white ring around the cornea suggestive of Acanthamoeba sp.
No7 highlighted that Cleadew kills 99% of acanthamoeba cells, offering patients "unparalleled protection" against the amoeba, which is highly resistant.
A YouGov poll for Fight for Sight revealed that a large proportion of UK contact lens wearers are putting their eyesight at risk through unsafe habits, unaware that they could develop infections like Acanthamoeba keratitis (AK).
Acanthamoeba is a ubiquitous protozoan that feeds on bacteria and yeast.
Professor Fiona Henriquez and her research team at the University of THEWEST of Scotland are investigating the causes and potential cure for acanthamoeba keratitis.
The reason may be due to prior treatment with antibiotics or a viral or acanthamoeba infection.
UK researchers have confirmed an uptick in cases of Acanthamoeba keratitis, an eye infection that most often affects contact lens wearers.