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Acanthamoeba keratitis

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https://www.readbyqxmd.com/read/29429293/-deep-anterior-lamellar-keratoplasty-combined-with-antiviral-therapy-in-the-treatment-of-severe-herpes-necrotizing-stromal-keratitis
#1
S X Li, J T Wang, Y Jiang, X Wang, W Y Shi
Objective: To evaluate the efficacy of modified deep lamellar keratoplasty (DLKP) combined with antiviral medications for severe herpes necrotizing stromal keratitis. Methods: Retrospective case series study. Modified DLKP was performed in combination with antiviral medications in fifty patients (50 eyes) with severe necrotizing stromal keratitis, which was unresponsive to systemic and topical antiviral treatment for 1 week, at Shandong Eye Hospital. Before surgery, the operated eyes were examined using slit-lamp microscopy...
February 11, 2018: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29412494/the-rising-tide-of-acanthamoeba-keratitis-in-auckland-new-zealand-a-7-year-review-of-presentation-diagnosis-and-outcomes-2009-2016
#2
James McKelvie, Moaz Alshiakhi, Mohammed Ziaei, Dipika V Patel, Charles Nj McGhee
IMPORTANCE: Acanthamoeba is an increasingly prevalent cause of vision-threatening microbial keratitis. BACKGROUND: To assess the incidence, clinical presentation, diagnosis and outcomes of patients with Acanthamoeba keratitis (AK) in Auckland, New Zealand over a 7-year period. DESIGN: Retrospective observational consecutive case series. PARTICIPANTS: Fifty-eight eyes of 52 patients diagnosed with AK. METHODS: All cases of AK were identified using a cross-referenced search of clinical, laboratory and pharmacy records from March 2009 to May 2016...
February 7, 2018: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/29390396/acute-keratoconjunctivitis-due-to-contamination-of-contact-lens-care-solution-with-histamine-producing-raoultella-species-a-case-report
#3
Hiroshi Eguchi, Fumika Hotta, Tomomi Kuwahara, Haruyuki Nakayama-Imaohji, Shunji Kusaka, Yoshikazu Shimomura
RATIONALE: Contact lens storage cases are known to be contaminated by a significant number of bacteria. However, histamine-producing Raoultella species has not been reported to contaminate contact lens storage case. PATIENT CONCERNS: A 27-year-old woman with keratoconjunctivitis that developed in the left eye owing to a cosmetic contact lens and poor hygiene was referred to our hospital. The corrected visual acuity was hand motion. DIAGNOSES: Corneal infection other than Acanthamoeba keratitis (AK) and corneal hypoxia were excluded...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29357901/can-artificial-tears-prevent-acanthamoeba-keratitis-an-in-vitro-approach
#4
Angela Magnet, Thiago Santos Gomes, Carmen Pardinas, Natalia Garcia de Blas, Cruz Sadaba, Eugenia Carrillo, Fernando Izquierdo, José Manuel Benítez Del Castillo, Carolina Hurtado, Carmen Del Aguila, Soledad Fenoy
BACKGROUND: The use of contact lenses has increased in recent years as has the incidence of Dry Eye Syndrome, partly due to their use. Artificial tears are the most common treatment option. Since these changes can facilitate Acanthamoeba infection, the present study has been designed to evaluate the effect of three artificial tears treatments in the viability of Acanthamoeba genotype T4 trophozoites. Optava Fusion™, Oculotect®, and Artelac® Splash were selected due to their formulation...
January 22, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29350163/amebaborne-attilina-massiliensis-keratitis-france
#5
Alexandre Battaini, Bernard La Scola, Gaëlle Ho Wang Yin, Louis Hoffart, Michel Drancourt
We report a case of Acanthamoeba castellani keratitis in a person who wore contact lenses. The amebae hosted an ameba-resistant bacterial symbiont, provisionally named "Attilina massiliensis," a yet undescribed α-Proteobacterium.
February 2018: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29340642/identifying-corneal-infections-in-formalin-fixed-specimens-using-next-generation-sequencing
#6
Zhigang Li, Florian P Breitwieser, Jennifer Lu, Albert S Jun, Laura Asnaghi, Steven L Salzberg, Charles G Eberhart
Purpose: We test the ability of next-generation sequencing, combined with computational analysis, to identify a range of organisms causing infectious keratitis. Methods: This retrospective study evaluated 16 cases of infectious keratitis and four control corneas in formalin-fixed tissues from the pathology laboratory. Infectious cases also were analyzed in the microbiology laboratory using culture, polymerase chain reaction, and direct staining. Classified sequence reads were analyzed with two different metagenomics classification engines, Kraken and Centrifuge, and visualized using the Pavian software tool...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29332157/acanthamoeba-keratitis-in-porto-alegre-southern-brazil-28-cases-and-risk-factors
#7
Denise Leal Dos Santos, Sergio Kwitko, Diane Ruschel Marinho, Bruno Schneider de Araújo, Claudete Inês Locatelli, Marilise Brittes Rott
The increasing use of contact lenses worldwide has led to an increase in cases of Acanthamoeba keratitis, which are often associated with inappropriate cleaning of contact lenses and lens cases. This study aimed to retrospectively review 28 cases of Acanthamoeba keratitis in Porto Alegre (southern Brazil) and identify the risk factors and clinical outcomes of affected patients. Most patients had higher education (66.6%), all were users of contact lenses, mostly women (67.9%). Most patients were soft contact lens wearers (66...
January 14, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29317876/occurrence-of-acanthamoeba-genotypes-in-wastewater-samples-in-tehran-iran
#8
Massoud Behnia, Karim Hatam-Nahavandi, Elham Hajialilo, Maryam Niyyati, Fatemeh Tarighi, Azam Bakhtiar Akram, Mahboobeh Salimi, Mostafa Rezaeian
Background: Acanthamoeba spp. is potentially pathogenic free-living amoeba that can exist in various water sources. The presence of this amoeba in water sources could be a health hazard as Acanthamoeba could lead to severe diseases such as Acanthamoeba keratitis and encephalitis. This study aimed to determine the genotypes of isolated Acanthamoeba spp. in raw wastewater samples in Tehran, Iran. Methods: Overall, 90 raw wastewater samples were collected from water treatment facilities in west and south of Tehran, Iran during 2014-2016...
October 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/29316961/combating-acanthamoeba-spp-cysts-what-are-the-options
#9
REVIEW
Ayaz Anwar, Naveed Ahmed Khan, Ruqaiyyah Siddiqui
Acanthamoeba spp. are protist pathogens and causative agents of serious infections including keratitis and granulomatous amoebic encephalitis. Its ability to convert into dormant and highly resistant cysts form limits effectiveness of available therapeutic agents and presents a pivotal challenge for drug development. During the cyst stage, Acanthamoeba is protected by the presence of hardy cyst walls, comprised primarily of carbohydrates and cyst-specific proteins, hence synthesis inhibition and/or degradation of cyst walls is of major interest...
January 9, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29303889/factors-influencing-the-diagnostic-accuracy-of-laser-scanning-in-vivo-confocal-microscopy-for-acanthamoeba-keratitis
#10
Ahmad Kheirkhah, Vannarut Satitpitakul, Zeba A Syed, Rodrigo Müller, Sunali Goyal, Elmer Y Tu, Reza Dana
PURPOSE: To determine the factors that influence the sensitivity and specificity of laser-scanning in vivo confocal microscopy (IVCM) for diagnosing Acanthamoeba keratitis (AK). METHODS: This retrospective, controlled study included 28 eyes of 27 patients with AK and 34 eyes of 34 patients with bacterial keratitis (as the control group). All patients had undergone corneal imaging with a laser-scanning IVCM (Heidelberg Retina Tomograph 3 with the Rostock Cornea Module)...
January 4, 2018: Cornea
https://www.readbyqxmd.com/read/29298778/acanthamoeba-keratitis-in-194-patients-risk-factors-for-bad-outcomes-and-severe-inflammatory-complications
#11
Nicole Carnt, Dana Robaei, Darwin C Minassian, John K G Dart
BACKGROUND/AIMS: To determine demographic and clinical features of patients with Acanthamoeba keratitis (AK) that are independent risk factors both for bad outcomes and for severe inflammatory complications (SIC). METHODS: A retrospective audit of medical records of AK cases at Moorfields Eye Hospital from July 2000 to April 2012, including 12 earlier surgical cases. Cases with a bad outcome were defined as those having one or more of the following: corneal perforation, keratoplasty, other surgery (except biopsy), duration of antiamoebic therapy (AAT) ≥10...
January 3, 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29296556/rapid-resolution-of-stromal-keratitis-with-the-assistance-of-oral-voriconazole-in-resistant-acanthamoeba-keratitis
#12
Tzu-Yu Hou, Yun-Chen Chen, Chih-Chien Hsu
Acanthamoeba keratitis (AK) is an unusual infectious disease of the cornea which sometimes leads to blindness. We report the experience of adding oral voriconazole in conjunction with topical antiacanthamoebic drops to treat refractory AK. A 20-year-old girl experienced a deep stromal keratitis with large epithelial defect in the left eye, suspected as AK. The initial best-corrected visual acuity (BCVA) of the eye was counting finger. She received topical chlorhexidine 0.02% and voriconazole 1% during the first 14 days but in vain...
October 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/29282148/acanthamoeba-mediated-cytopathic-effect-correlates-with-mbp-and-ahlbp-mrna-expression
#13
Sook-Luan Ng, Anisah Nordin, Norzana Abd Ghafar, Yusof Suboh, Noraina Ab Rahim, Kien-Hui Chua
BACKGROUND: In recent years, the concern of Acanthamoeba keratitis has increased since the infection is often associated with contact lens use. Partial 18S rRNA genotypic identification of Acanthamoeba isolates is important to correlate with pathophysiological properties in order to evaluate the degree of virulence. This is the first report of genotypic identification for clinical isolates of Acanthamoeba from corneal scrapings of keratitis in Malaysia. This study is also the first to correlate the mRNA expression of MBP and AhLBP as virulent markers for axenic strains of Acanthamoeba...
December 28, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29274209/amoebicidal-or-amoebostatic-influence-of-disinfectants-used-in-health-facilities-and-laboratories-on-corneal-strains-of-acanthamoeba
#14
Wanda Baltaza, Marcin Padzik, Jacek P Szaflik, Monika Dybicz, Edyta Hendiger, Lidia Chomicz
Different Acanthamoeba species are amphizoic organisms distributed in wide range of habitats in natural and man-made environments; they are also detected on surfaces of equipment and accessories in health facilities. Some strains of the amoebae are causative agents of the vision-threatening human disease Acanthamoeba keratitis, mainly reported in contact lens wearers. An exceptional high resistance of Acanthamoeba trophozoites and particularly cysts to chemicals, disinfectants and drugs is believed as influencing difficulty resulting in unsuccessful therapeutic management...
2017: Annals of Parasitology
https://www.readbyqxmd.com/read/29273391/acanthamoeba-in-the-eye-can-the-parasite-hide-even-more-latest-developments-on-the-disease
#15
REVIEW
M M Juárez, L I Tártara, A G Cid, J P Real, J M Bermúdez, V B Rajal, S D Palma
Acanthamoeba spp. is a free living protozoan in the environment, but can cause serious diseases. Acanthamoeba keratitis (AK), a severe and painful eye infection, must be treated as soon as possible to prevent ulceration of the cornea, loss of visual acuity, and eventually blindness or enucleation. Although the disease affects principally contact lens (CLs) wearers, it is recognized nowadays as a cause of keratitis also in non-CLs wearers. Although the number of infections caused by these amoebae is low, AK is an emerging disease presenting an extended number of cases each year worldwide mostly due to the increasing use of CLs, but also to better diagnostic methods and awareness...
December 19, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29260080/moraxella-atlantae-keratitis-presenting-with-an-infectious-ring-ulcer
#16
Alexander Barash, Timothy Y Chou
Purpose: Moraxella atlantae is a rare pathogen. Keratitis from this organism has never been specifically reported or described. In this report we provide the first clinical description and photograph of Moraxella atlantae infectious keratitis. Observations: A 41 year-old man presented with a three day history of left eye pain. He was found to have a corneal ring ulcer and infiltrate from which Moraxella atlantae was cultured. The patient was successfully treated with intensive topical gatifloxacin (0...
September 2017: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29260063/results-with-the-boston-type-i-keratoprosthesis-after-acanthamoeba-keratitis
#17
Albert Santos, Luzia Diegues Silva, Luciene Barbosa de Sousa, Denise de Freitas, Lauro Augusto de Oliveira
Purpose: To report the outcomes of implantation of the Boston Type I keratoprosthesis in three patients with Acanthamoeba keratitis (AK), a severe infection that can lead to significant visual loss. Observations: Case series reporting three patients with difficult cases of AK that needed multiple corneal transplantations and glaucoma surgeries. All patients were implanted with the Boston Type I keratoprosthesis device. The main outcomes measure were the visual function and anatomical retention after implantation of the Boston Type I keratoprosthesis...
June 2017: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29258252/pathogenic-acanthamoeba-castellanii-secretes-the-extracellular-aminopeptidase-m20-m25-m40-family-protein-to-target-cells-for-phagocytosis-by-disruption
#18
Jian-Ming Huang, Chen-Chieh Liao, Chung-Ching Kuo, Lih-Ren Chen, Lynn L H Huang, Jyh-Wei Shin, Wei-Chen Lin
Acanthamoeba is free-living protist pathogen capable of causing a blinding keratitis and granulomatous encephalitis. However, the mechanisms of Acanthamoeba pathogenesis are still not clear. Here, our results show that cells co-cultured with pathogenic Acanthamoeba would be spherical and floated, even without contacting the protists. Then, the Acanthamoeba protists would contact and engulf these cells. In order to clarify the contact-independent pathogenesis mechanism in Acanthamoeba, we collected the Acanthamoeba-secreted proteins (Asp) to incubate with cells for identifying the extracellular virulent factors and investigating the cytotoxicity process...
December 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29248979/application-of-modified-jdp-dgge-based-molecular-genotyping-method-to-predict-acanthamoeba-genotype-and-to-analyse-community-diversity-in-aquatic-environments
#19
Tsui-Kang Hsu, Jung-Sheng Chen, Bing-Mu Hsu, Yu-Pin Chen, Tsai-Hsueh Leu, Tung-Yi Huang, Yu-Wen Hsu, Shu-Fen Wu
Acanthamoeba spp. are ubiquitous, opportunistic potential human pathogens, causing granulomatous amoebic encephalitis and keratitis. They are classified as protozoa, and they include at least 20 different genotypes (T1-T20) based on variation in the 18S rRNA gene. Acanthamoeba spp. are diverse in their production of toxins and in their ability to resist environmental factors. Therefore, it is necessary to develop a rapid genotyping method for Acanthamoeba spp. in aquatic environments. Although the denaturing gradient gel electrophoresis (DGGE) method for analysing microbial genotypes is potentially useful for rapid identification of aquatic environmental species, the technique has been compromised by artificial DGGE profiles in which many DNA fragments of identical sequences are segregated and displayed as different bands...
December 17, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29233457/antimicrobial-efficacy-of-a-novel-povidone-iodine-contact-lens-disinfection-system
#20
Katsuhide Yamasaki, Fumio Saito, Ritsue Ota, Simon Kilvington
PURPOSE: Contact lens (CL) wear is a risk factor for the acquisition of microbial keratitis. Accordingly, compliance to manufacturers' recommended hygiene and disinfection procedures are vital to safe (CL) use. In this study we evaluated a novel povidone-iodine (PI) (CL) disinfection system (cleadew, Ophtecs Corporation, Japan) against a range of bacterial, fungal and Acanthamoeba. METHODS: Antimicrobial assays were conducted according to ISO 14729 using the recommended strains of bacteria and fungi, with and without the presence of organic soil...
December 7, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
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