scholarly journals Identification of Naegleria fowleri proteins linked to primary amoebic meningoencephalitis

Microbiology ◽  
2017 ◽  
Vol 163 (3) ◽  
pp. 322-332 ◽  
Author(s):  
Melissa Jamerson ◽  
Jacqueline A Schmoyer ◽  
Jay Park ◽  
Francine Marciano-Cabral ◽  
Guy A Cabral
Keyword(s):  
Naegleria Fowleri ◽  
Primary Amoebic Meningoencephalitis ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis

Primary amoebic meningoencephalitis with Naegleria fowleri: Clinical review

1996 ◽  
Vol 15 (3) ◽  
pp. 230-234 ◽  
Author(s):  
Nancy D.P. Barnett ◽  
Allen M. Kaplan ◽  
Robert J. Hopkin ◽  
Michael A. Saubolle ◽  
Mark F. Rudinsky
Keyword(s):  
Clinical Review ◽  
Naegleria Fowleri ◽  
Primary Amoebic Meningoencephalitis ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis

scholarly journals Primary amoebic meningoencephalitis due to Naegleria fowleri

2011 ◽  
Vol 32 (2) ◽  
Author(s):  
A Angrup ◽  
L Chandel ◽  
A Sood ◽  
K Thakur ◽  
SC Jaryal
Keyword(s):  
Naegleria Fowleri ◽  
Primary Amoebic Meningoencephalitis ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis

scholarly journals Primary Amoebic Meningoencephalitis by Naegleria fowleri: Pathogenesis and Treatments

Biomolecules ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1320 ◽  
Author(s):  
Andrea Güémez ◽  
Elisa García
Keyword(s):  
Molecular Mechanisms ◽  
Case Reports ◽  
Naegleria Fowleri ◽  
Initial Exposure ◽  
Immunomodulatory Agents ◽  
Primary Amoebic Meningoencephalitis ◽  
The Central Nervous System ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis ◽  
The Brain

Naegleria fowleri is a free-living amoeba (FLA) that is commonly known as the “brain-eating amoeba.” This parasite can invade the central nervous system (CNS), causing an acute and fulminating infection known as primary amoebic meningoencephalitis (PAM). Even though PAM is characterized by low morbidity, it has shown a mortality rate of 98%, usually causing death in less than two weeks after the initial exposure. This review summarizes the most recent information about N. fowleri, its pathogenic molecular mechanisms, and the neuropathological processes implicated. Additionally, this review includes the main therapeutic strategies described in case reports and preclinical studies, including the possible use of immunomodulatory agents to decrease neurological damage.

scholarly journals A Fatal Case of Primary Amoebic Meningoencephalitis (PAM) Complicated with Diabetes Insipidus (DI): A Case Report and Review of the Literature

2020 ◽  
Vol 2020 ◽  
pp. 1-3
Author(s):  
Muhammad Zain Mushtaq ◽  
Saad Bin Zafar Mahmood ◽  
Adil Aziz
Keyword(s):  
Diabetes Insipidus ◽  
Rare Complication ◽  
Fatal Case ◽  
Urine Osmolality ◽  
Developed Countries ◽  
Polymorphonuclear Cells ◽  
Naegleria Fowleri ◽  
Primary Amoebic Meningoencephalitis ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis

Naegleria fowleri is a highly infective free-living amoeba usually isolated from soil and fresh water and is primarily found to infect the central nervous system (CNS) resulting in primary amoebic meningoencephalitis (PAM). PAM as a cause of meningitis is often overlooked for other, more common causes of meningitis. Despite all the advances in antimicrobial therapy and supportive care systems, the mortality rate of this rare infection remains above 95% with the bulk of the cases being found in developed countries. We are presenting a case of a 44-year-old male with fever, worsening headache, and generalized weakness. Lumbar puncture showed a raised leucocyte count of 1100/µL with predominant polymorphonuclear cells, and wet mount prep for Naegleria fowleri was positive further confirmed with PCR. The patient was started Intravenous (IV) and intrathecal amphotericin-B, Per Oral (PO) miltefosine, IV rifampin, IV fluconazole, and IV dexamethasone. However, the patient started producing urine at 300–500 ml/hour. The patient’s sodium levels increased from 144 to 175 mmol/L in 12 hours with raised serum osmolality and decreased urine osmolality and urine sodium. The patient was started on PO desmopressin of 0.2 micrograms twice daily after which his urine output dropped to 60–80 ml/hour and sodium decreased from 175 to 162 and, later 155 mmol/L; however, the patient expired. PAM is a rare and extremely fatal illness, but with increasing incidence now being reported in developing countries as a result of better diagnostics. DI is a very rare complication reported in these patients leading to poor outcome. The complication of diabetes insipidus (DI) has not been extensively studied in patients having PAM. Only three cases have been reported with this complication. No mechanism has been mentioned in the literature behind the development of DI in these patients, and no study has mentioned laboratory details of DI as mentioned in this report.

scholarly journals Nanopore sequencing improves the draft genome of the human pathogenic amoeba Naegleria fowleri

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Nicole Liechti ◽  
Nadia Schürch ◽  
Rémy Bruggmann ◽  
Matthias Wittwer
Keyword(s):  
Draft Genome ◽  
Olfactory Nerve ◽  
Naegleria Fowleri ◽  
Pathogenic Potential ◽  
Primary Amoebic Meningoencephalitis ◽  
Long Reads ◽  
Oxford Nanopore ◽  
Facultative Parasite ◽  
Nægleria Fowleri ◽  
Amoebic Meningoencephalitis

Abstract Naegleria fowleri is an environmental protist found in soil and warm freshwater sources worldwide and is known for its ability to infect humans and causing a rapid and mostly fatal primary amoebic meningoencephalitis. When contaminated water enters the nose, the facultative parasite follows the olfactory nerve and enters the brain by crossing the cribriform plate where it causes tissue damage and haemorrhagic necrosis. Although N. fowleri has been studied for several years, the mechanisms of pathogenicity are still poorly understood. Furthermore, there is a lack of knowledge on the genomic level and the current reference assembly is limited in contiguity. To improve the draft genome and to investigate pathogenicity factors, we sequenced the genome of N. fowleri using Oxford Nanopore Technology (ONT). Assembly and polishing of the long reads resulted in a high-quality draft genome whose N50 is 18 times higher than the previously published genome. The prediction of potentially secreted proteins revealed a large proportion of enzymes with a hydrolysing function, which could play an important role during the pathogenesis and account for the destructive nature of primary amoebic meningoencephalitis. The improved genome provides the basis for further investigation unravelling the biology and the pathogenic potential of N. fowleri.

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