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"amebic encephalitis"

Case Reports

Diagnosing Balamuthia mandrillaris amebic meningoencephalitis in a 64-year-old woman from the Southwest of China
Suhua Yao, Xiaoting Chen, Lian Qian, Shizheng Sun, Chunjing Zhao, Zongkai Bai, Zhaofang Chen, Youcong Wu
Parasites Hosts Dis 2023;61(2):183-193.
Published online May 23, 2023
DOI: https://doi.org/10.3347/PHD.23039
Balamuthia mandrillaris amebic encephalitis (BAE) can cause a fatal condition if diagnosis is delayed or effective treatment is lacking. Patients with BAE have been previously reported in 12 provinces of China, with skin lesions being the primary symptom and encephalitis developing after several years. However, a significantly lower number of cases has been reported in Southwest China. Here we report an aggressive BAE case of a 64-year-old woman farmer with a history of skin lesions on her left hand. She was admitted to our hospital due to symptoms of dizziness, headache, cough, vomiting, and gait instability. She was initially diagnosed with syphilitic meningoencephalitis and received a variety of empirical treatment that failed to improve her symptoms. Finally, she was diagnosed with BAE combined with amebic pneumonia using next-generation sequencing (NGS), qRT-PCR, sequence analysis, and imaging studies. She died approximately 3 weeks after the onset. This case highlights that the rapid development of encephalitis can be a prominent clinical manifestation of Balamuthia mandrillaris infection.

Citations

Citations to this article as recorded by  Crossref logo
  • The role of plasma metagenomic sequencing in identification of Balamuthia mandrillaris encephalitis
    Sarah Y. Edminster, Ryan W. Rebbe, Christopher Khatchadourian, Kyle M. Hurth, Anna J. Mathew, Julie Huss-Bawab, Mark S. Shiroishi, Devin Clark, Andrew P. Norgan, Susan M. Butler-Wu, Annie Hiniker
    Acta Neuropathologica Communications.2025;[Epub]     CrossRef
  • Balamuthia amoebic encephalitis directly causing intracranial infection: A case report
    Yuhan Liang, Yanhong Liu, Zelong Chen, Jiayi Sun, Xuemeng Zhang, Yulin Wang
    Radiology Case Reports.2025; 20(6): 2820.     CrossRef
  • Pulmonary infection due to Balamuthia mandrillaris in the southwestern United States: not all miliary disease is tuberculosis and coccidioidomycosis
    N. B. Price, H. Pariury, J. Papic, M. R. Anthony, W. Lainhart, K. W. Shehab, Carey-Ann D. Burnham
    ASM Case Reports.2025;[Epub]     CrossRef
  • Applications of the powerful next-generation sequencing tool for detecting parasitic infections: towards a smart laboratory platform
    Bahareh Basirpour, Rabeeh Tabaripour, Farzane Jafarian, Mahdi Fakhar, Hajar Ziaei Hezarjaribi, Shirzad Gholami
    Microbial Pathogenesis.2025; 206: 107746.     CrossRef
  • Next-Generation Sequencing for Diagnosis of Fatal Balamuthia Amoebic Encephalitis: A Case Report
    Yuanyuan Feng, Huiyu Feng, Xuegao Yu, Jing Zhao, Hongyan Zhou, Jiaoxing Li, Peisong Chen, Li Feng
    Diagnostics.2025; 15(20): 2590.     CrossRef
  • Dexamethasone/fructose/glycerol/sodium-chloride/mannitol

    Reactions Weekly.2023; 1970(1): 114.     CrossRef
  • 5,289 View
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Fatal Balamuthia Amebic Encephalitis in a Healthy Child: A Case Report with Review of Survival Cases
A. Krasaelap, S. Prechawit, J. Chansaenroj, P. Punyahotra, T. Puthanakit, K. Chomtho, S. Shuangshoti, J. Amornfa, Y. Poovorawan
Korean J Parasitol 2013;51(3):335-341.
Published online June 30, 2013
DOI: https://doi.org/10.3347/kjp.2013.51.3.335

Balamuthia mandrillaris is one of the 4 amebas in fresh water and soil that cause diseases in humans. Granulomatous amebic encephalitis (GAE), caused by B. mandrillaris, is a rare but life-threatening condition. A 4-year-old, previously healthy, Thai girl presented with progressive headache and ataxia for over a month. Neuroimaging studies showed an infiltrative mass at the right cerebellar hemisphere mimicking a malignant cerebellar tumor. The pathological finding after total mass removal revealed severe necrotizing inflammation, with presence of scattered amebic trophozoites. Cerebrospinal fluid (CSF) obtained from lumbar puncture showed evidence of non-specific inflammation without identifiable organisms. A combination of pentamidine, sulfasalazine, fluconazole, and clarithromycin had been initiated promptly before PCR confirmed the diagnosis of Balamuthia amebic encephalitis (BAE). The patient showed initial improvement after the surgery and combined medical treatment, but gradually deteriorated and died of multiple organ failure within 46 days upon admission despite early diagnosis and treatment. In addition to the case, 10 survivors of BAE reported in the PubMed database were briefly reviewed in an attempt to identify the possible factors leading to survival of the patients diagnosed with this rare disease.

Citations

Citations to this article as recorded by  Crossref logo
  • The role of plasma metagenomic sequencing in identification of Balamuthia mandrillaris encephalitis
    Sarah Y. Edminster, Ryan W. Rebbe, Christopher Khatchadourian, Kyle M. Hurth, Anna J. Mathew, Julie Huss-Bawab, Mark S. Shiroishi, Devin Clark, Andrew P. Norgan, Susan M. Butler-Wu, Annie Hiniker
    Acta Neuropathologica Communications.2025;[Epub]     CrossRef
  • A Novel Balamuthia Lineage Causing Fatal Granulomatous Amoebic Encephalitis in an Immunocompetent Infant
    Zhongqiu Teng, Linlin Liu, Tianming Chen, Junrong Liang, Xingfeng Yao, Na Zhao, Fengmao Zhao, Hailang Sun, Lijuan Wang, Quan Wang, Gang Liu, Tian Qin
    International Journal of Infectious Diseases.2025; 161: 108063.     CrossRef
  • Balamuthia Amebic Encephalitis Cured and Discharged
    Benda Qin, Liyan Jia, Jian Chen, Wei Liu
    Journal of Craniofacial Surgery.2024; 35(6): e496.     CrossRef
  • Non-granulomatous meningoencephalitis with Balamuthia mandrillaris mimicking a tumor: First confirmed case from Pakistan
    Zanib Javed, Mustafa Mushtaq Hussain, Najia Ghanchi, Ahmed Gilani, S. Ather Enam
    Surgical Neurology International.2024; 15: 238.     CrossRef
  • Diagnosing Balamuthia mandrillaris amebic meningoencephalitis in a 64-year-old woman from the Southwest of China
    Suhua Yao, Xiaoting Chen, Lian Qian, Shizheng Sun, Chunjing Zhao, Zongkai Bai, Zhaofang Chen, Youcong Wu
    Parasites, Hosts and Diseases.2023; 61(2): 183.     CrossRef
  • Phenotypic assay for cytotoxicity assessment of Balamuthia mandrillaris against human neurospheroids
    Narisara Whangviboonkij, Worakamol Pengsart, Zhenzhong Chen, Seokgyu Han, Sungsu Park, Kasem Kulkeaw
    Frontiers in Microbiology.2023;[Epub]     CrossRef
  • Diagnosis of Balamuthia mandrillaris Encephalitis by Thymine–Adenine Cloning Using Universal Eukaryotic Primers
    Ju Yeong Kim, Myung-Hee Yi, Myungjun Kim, Joon-Sup Yeom, Hyun Dong Yoo, Seong Min Kim, Tai-Soon Yong
    Annals of Laboratory Medicine.2022; 42(2): 196.     CrossRef
  • A patient with granulomatous amoebic encephalitis caused by Balamuthia mandrillaris survived with two excisions and medication
    Limei Peng, Quan Zhou, Yu Wu, Xiaoli Cao, Zili Lv, Minghua Su, Yachun Yu, Wen Huang
    BMC Infectious Diseases.2022;[Epub]     CrossRef
  • Cutaneous balamuthiasis: A clinicopathological study
    Patricia Alvarez, Carlos Torres-Cabala, Eduardo Gotuzzo, Francisco Bravo
    JAAD International.2022; 6: 51.     CrossRef
  • Encephalomyelitis Caused by Balamuthia mandrillaris in a Woman With Breast Cancer: A Case Report and Review of the Literature
    Juan Hu, Yiqi Zhang, Yongwei Yu, Huili Yu, Siruo Guo, Ding Shi, Jianqin He, Chi Hu, Jiqi Yang, Xueling Fang, Yonghong Xiao
    Frontiers in Immunology.2022;[Epub]     CrossRef
  • An Optical and Chemiluminescence Assay for Assessing the Cytotoxicity of Balamuthia mandrillaris against Human Neurospheroids
    Worakamol Pengsart, Kasem Kulkeaw
    Bioengineering.2022; 9(7): 330.     CrossRef
  • Distribution and Current State of Molecular Genetic Characterization in Pathogenic Free-Living Amoebae
    Alejandro Otero-Ruiz, Leobardo Daniel Gonzalez-Zuñiga, Libia Zulema Rodriguez-Anaya, Luis Fernando Lares-Jiménez, Jose Reyes Gonzalez-Galaviz, Fernando Lares-Villa
    Pathogens.2022; 11(10): 1199.     CrossRef
  • Diagnostic evaluation of fatal Balamuthia mandrillaris meningoencephalitis in a captive Bornean orangutan (Pongo pygmaeus) with identification of potential environmental source and evidence of chronic exposure
    Shawna J. Hawkins, Jason D. Struthers, Kristen Phair, Ibne Karim M. Ali, Shantanu Roy, Bonnie Mull, Gary West
    Primates.2021; 62(1): 51.     CrossRef
  • Current report on the prevalence of free-living amoebae (FLA) in natural hot springs: a systematic review
    Mary Rachael Leigh Fabros, Xyleen Rianne Shae Diesta, John Anthony Oronan, Kim Sofia Verdejo, Joe-Anna Sheilla Marie Garcia, Ma. Sophia Romey, Giovanni De Jesus Milanez
    Journal of Water and Health.2021; 19(4): 563.     CrossRef
  • Various brain-eating amoebae: the protozoa, the pathogenesis, and the disease
    Hongze Zhang, Xunjia Cheng
    Frontiers of Medicine.2021; 15(6): 842.     CrossRef
  • Diagnosing Balamuthia mandrillaris encephalitis via next-generation sequencing in a 13-year-old girl
    Xia Wu, Gangfeng Yan, Shuzhen Han, Yingzi Ye, Xunjia Cheng, Hairong Gong, Hui Yu
    Emerging Microbes & Infections.2020; 9(1): 1379.     CrossRef
  • Discovery of Anti-Amoebic Inhibitors from Screening the MMV Pandemic Response Box on Balamuthia mandrillaris, Naegleria fowleri, and Acanthamoeba castellanii
    Christopher A. Rice, Emma V. Troth, A. Cassiopeia Russell, Dennis E. Kyle
    Pathogens.2020; 9(6): 476.     CrossRef
  • “Proposals for Amendments in the Diagnosis and Treatment of Encephalitis caused by Free-living Amoebae”
    Abdul Mannan Baig
    Infectious Disorders - Drug Targets .2020; 20(2): 115.     CrossRef
  • Balamuthia mandrillaris infection in China: a retrospective report of 28 cases
    Lei Wang, Wenjing Cheng, Bing Li, Zhe Jian, Xianlong Qi, Dongjie Sun, Jian Gao, Xuetao Lu, Yi Yang, Kun Lin, Chuanlong Lu, Jiaxi Chen, Chunying Li, Gang Wang, Tianwen Gao
    Emerging Microbes & Infections.2020; 9(1): 2348.     CrossRef
  • Balamuthia mandrillaris Granulomatous Amebic Encephalitis With Renal Dissemination in a Previously Healthy Child: Case Report and Review of the Pediatric Literature
    Kareem W Shehab, Khalid Aboul-Nasr, Sean P Elliott
    Journal of the Pediatric Infectious Diseases Society.2018; 7(3): e163.     CrossRef
  • Functional Assessment of 2,177 U.S. and International Drugs Identifies the Quinoline Nitroxoline as a Potent Amoebicidal Agent against the Pathogen Balamuthia mandrillaris
    Matthew T. Laurie, Corin V. White, Hanna Retallack, Wesley Wu, Matthew S. Moser, Judy A. Sakanari, Kenny Ang, Christopher Wilson, Michelle R. Arkin, Joseph L. DeRisi, Bonnie Bassler, Ibne Ali, Timothy Geary
    mBio.2018;[Epub]     CrossRef
  • Amoebic meningoencephalitis and disseminated infection caused by Balamuthia mandrillaris in a Western lowland gorilla (Gorilla gorilla gorilla)
    Jenessa L. Gjeltema, Brigid Troan, Atis Muehlenbachs, Lindy Liu, Alexandre J. Da Silva, Yvonne Qvarnstrom, Jeremy R. Tobias, Michael R. Loomis, Ryan S. De Voe
    Journal of the American Veterinary Medical Association.2016; 248(3): 315.     CrossRef
  • Amoebic encephalitis: case report and literature review of neuroimaging findings
    Matthew William Lukies, Yoshiyuki Watanabe, Tetsuo Maeda, Shinsuke Kusakabe, Hideyuki Arita, Noriyuki Tomiyama
    BJR|case reports.2016;[Epub]     CrossRef
  • Transmission ofBalamuthia mandrillarisby Organ Transplantation
    Eileen C. Farnon, Kenneth E. Kokko, Philip J. Budge, Chukwuma Mbaeyi, Emily C. Lutterloh, Yvonne Qvarnstrom, Alexandre J. da Silva, Wun-Ju Shieh, Sharon L. Roy, Christopher D. Paddock, Rama Sriram, Sherif R. Zaki, Govinda S. Visvesvara, Matthew J. Kuehner
    Clinical Infectious Diseases.2016; 63(7): 878.     CrossRef
  • Denouement

    Pediatric Infectious Disease Journal.2014; 33(9): 995.     CrossRef
  • Balamuthia mandrillaris in South America: An emerging potential hidden pathogen in Perú
    Alfonso M. Cabello-Vílchez, Salvador Rodríguez-Zaragoza, José Piñero, Basilio Valladares, Jacob Lorenzo-Morales
    Experimental Parasitology.2014; 145: S10.     CrossRef
  • What is new about epidemiology of acute infectious encephalitis?
    Jean-Paul Stahl, Alexandra Mailles
    Current Opinion in Neurology.2014; 27(3): 337.     CrossRef
  • Is Balamuthia mandrillaris a public health concern worldwide?
    Jacob Lorenzo-Morales, Alfonso Martín Cabello-Vílchez, Carmen Mª Martín-Navarro, Enrique Martínez-Carretero, José E. Piñero, Basilio Valladares
    Trends in Parasitology.2013; 29(10): 483.     CrossRef
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Original Article
Comparison of specific activity and cytopathic effects of purified 33 kDa serine proteinase from Acanthamoeba strains with different degree of virulence
Won-Tae Kim, Hyun-Hee Kong, Young-Ran Ha, Yeon-Chul Hong, Hae Jin Jeong, Hak Sun Yu, Dong-Il Chung
Korean J Parasitol 2006;44(4):321-330.
Published online December 20, 2006
DOI: https://doi.org/10.3347/kjp.2006.44.4.321

The pathogenic mechanism of granulomatous amebic encephalitis (GAE) and amebic keratitis (AK) by Acanthamoeba has yet to be clarified. Protease has been recognized to play an important role in the pathogenesis of GAE and AK. In the present study, we have compared specific activity and cytopathic effects (CPE) of purified 33 kDa serine proteinases from Acanthamoeba strains with different degree of virulence (A. healyi OC-3A, A. lugdunensis KA/E2, and A. castellanii Neff). Trophozoites of the 3 strains revealed different degrees of CPE on human corneal epithelial (HCE) cells. The effect was remarkably reduced by adding phenylmethylsulfonylfluoride (PMSF), a serine proteinase inhibitor. This result indicated that PMSF-susceptible proteinase is the main component causing cytopathy to HCE cells by Acanthamoeba. The purified 33 kDa serine proteinase showed strong activity toward HCE cells and extracellular matrix proteins. The purified proteinase from OC-3A, the most virulent strain, demonstrated the highest enzyme activity compared to KA/E2, an ocular isolate, and Neff, a soil isolate. Polyclonal antibodies against the purified 33 kDa serine proteinase inhibit almost completely the proteolytic activity of culture supernatant of Acanthamoeba. In line with these results, the 33 kDa serine proteinase is suggested to play an important role in pathogenesis and to be the main component of virulence factor of Acanthamoeba.

Citations

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  • Calcium ions in tap water may increase the adhesion ability of Acanthamoeba, potentially enhancing its cytopathic effects on corneal cells
    Yu-Jen Wang, Yao-Tsung Chang, Tsun-Hsien Hsiao, Chun-Hsien Chen, Chih-Ming Tsai, Jian-Ming Huang
    Parasite.2025; 32: 71.     CrossRef
  • Proteases of Acanthamoeba
    Behroz Mahdavi Poor, Jalil Rashedi, Vahid Asgharzadeh, Amirali Mirmazhary, Nazila Gheitarani
    Parasitology Research.2024;[Epub]     CrossRef
  • Characterization of novel extracellular proteases produced by Acanthamoeba castellanii after contact with human corneal epithelial cells and their relevance to pathogenesis
    Alvie Loufouma-Mbouaka, Tania Martín-Pérez, Martina Köhsler, Zeynep Danisman, Maya Schwarz, Rounik Mazumdar, Ascel Samba-Louaka, Julia Walochnik
    Parasites & Vectors.2024;[Epub]     CrossRef
  • Comparative cytotoxicity of Acanthamoeba castellanii-derived conditioned medium on human corneal epithelial and stromal cells
    Abdullah Alhazmi, Laura E. Sidney, Andy Hopkinson, Hany M. Elsheikha
    Acta Tropica.2024; 257: 107288.     CrossRef
  • Assessment of in vitro dynamics of pathogenic environmental Acanthamoeba T4 and T9 genotypes isolated from three recreational lakes in Klang Valley, Malaysia over the HaCaT cell monolayer
    Rohaya Abdul Halim, Hasseri Halim, Rosnani Hanim Mohd Hussain, Shafiq Aazmi, Naveed Ahmed Khan, Ruqaiyyah Siddiqui, Tengku Shahrul Anuar
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    Processes.2023; 11(9): 2620.     CrossRef
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    Daniele Corsaro
    Microorganisms.2022; 10(11): 2162.     CrossRef
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    Ana Carolina Carvalho-Silva, Camila H. Coelho, Cecília Cirelli, Frederico Crepaldi, Isabela Aurora Rodrigues-Chagas, Cinthia Furst, Daniel Carvalho Pimenta, Juliano Simões de Toledo, Ana Paula Fernandes, Adriana Oliveira Costa
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  • Peganum harmala Extract Has Antiamoebic Activity to Acanthamoeba triangularis Trophozoites and Changes Expression of Autophagy-Related Genes
    Rachasak Boonhok, Suthinee Sangkanu, Julalak Chuprom, Mayuna Srisuphanunt, Roghayeh Norouzi, Abolghasem Siyadatpanah, Farzaneh Mirzaei, Watcharapong Mitsuwan, Sueptrakool Wisessombat, Maria de Lourdes Pereira, Mohammed Rahmatullah, Polrat Wilairatana, Chr
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  • Pathogenesis of Acanthamoeba Keratitis
    Noorjahan Panjwani
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  • Acanthamoeba culbertsoni Elicits Soluble Factors That Exert Anti-Microglial Cell Activity
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  • Differential effects of α-helical and β-hairpin antimicrobial peptides against Acanthamoeba castellanii
    R. S. SACRAMENTO, R. M. MARTINS, A. MIRANDA, A. S. S. DOBROFF, S. DAFFRE, A. S. FORONDA, D. DE FREITAS, S. SCHENKMAN
    Parasitology.2009; 136(8): 813.     CrossRef
  • Elastase secretion in Acanthamoeba polyphaga
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    Acta Tropica.2009; 112(2): 156.     CrossRef
  • Characterization of a Serine Proteinase Mediating Encystation of Acanthamoeba
    Eun-Kyung Moon, Dong-Il Chung, Yeon-Chul Hong, Hyun-Hee Kong
    Eukaryotic Cell.2008; 7(9): 1513.     CrossRef
  • Differentially expressed genes of Acanthamoeba castellanii during encystation
    Eun-Kyung Moon, Dong-Il Chung, Yeon-Chul Hong, Hyun-Hee Kong
    The Korean Journal of Parasitology.2007; 45(4): 283.     CrossRef
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