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Acanthamoeba keratitis

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https://www.readbyqxmd.com/read/29663139/corneal-biopsy-for-diagnosis-of-recalcitrant-microbial-keratitis
#1
Dana Robaei, U-Teng Chan, Pauline Khoo, Svetlana Cherepanoff, Yi-Chiao Li, Jane Hanrahan, Stephanie Watson
PURPOSE: To document the findings of corneal biopsies for progressive microbial keratitis in a large tertiary referral institution. METHODS: A retrospective medical records review of all patients who underwent at least one corneal biopsy for the diagnosis of microbial keratitis at Sydney Eye Hospital, Australia between January 1, 2010 and December 31, 2016 was performed. RESULTS: Thirty-eight patients (18 men and 20 women) underwent a corneal biopsy for progressive microbial keratitis unresponsive to broad-spectrum topical antimicrobials...
April 16, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29657977/expert-practice-patterns-and-opinions-on-corneal-cross-linking-for-infectious-keratitis
#2
Yen C Hsia, Caitlin A Moe, Thomas M Lietman, Jeremy D Keenan, Jennifer Rose-Nussbaumer
Objective: To assess the current opinion and practice patterns from cornea experts regarding the benefit of corneal cross-linking (CXL) for infectious keratitis (IK). Methods and analysis: An international survey was distributed to corneal specialists via an internet survey. The survey data collected were analysed with descriptive statistics. Results: A survey was sent to 190 recipients, and 29 (15%) respondents completed the survey with an average of 7 years' experience using CXL...
2018: BMJ open ophthalmology
https://www.readbyqxmd.com/read/29642830/-a-new-strategy-for-enhancing-acanthamoebicidal-activity-with-synthesis-of-nanoflower-of-laurocerausus-officinalis-roemer-cherry-laurel-fruit-extracts
#3
Ayşe Baldemir, Ülkü Karaman, Sadi Yusufbeyoğlu, Ayşe Eken, Nilay Ildız, Selen İlgün, Cemil Çolak, Gamze Kaçmaz, İsmail Öçsoy, Soner Çankaya
Pathogenic Acanthamoeba species often cause infection known as Acanthamoeba keratitis among people who use contact lenses. It is a type of infection that can result in corneal ulceration, visual loss or even blindness, if not treated. There are various therapeutic options available in the treatment of Acanthamoeba infections but they are usually tough treatments with limited efficacy. For instance, hydrogen peroxide (H2 O2 ) is a commonly used contact lens disinfectant which is effective against Acanthamoeba but it is toxic to the cornea...
January 2018: Mikrobiyoloji Bülteni
https://www.readbyqxmd.com/read/29625097/chloroquine-as-a-possible-disinfection-adjunct-of-disinfection-solutions-against-acanthamoeba
#4
Eun-Kyung Moon, Seungeun Lee, Fu-Shi Quan, Hyun-Hee Kong
Acanthamoeba keratitis is commonly encountered by contact lens wearers. Contact lens solution plays an important role in the safe use of contact lenses. The most popular products for disinfecting lenses are multipurpose disinfecting solutions (MPDS). However, almost all MPDS retailed in Korea are ineffective in killing Acanthamoeba. The objective of this study was to determine the possibility of using autophagy inhibitor chloroquine as a disinfecting agent to improve the amoebicidal activity of MPDS against Acanthamoeba, especially the cyst...
April 3, 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29596605/evaluation-of-voriconazole-anti-acanthamoeba-polyphaga-in-vitro-activity-rat-cornea-penetration-and-efficacy-against-experimental-rat-acanthamoeba-keratitis
#5
Julie Gueudry, Laetitia Le Goff, Patricia Compagnon, Sabine Lefevre, Elodie Colasse, Camille Aknine, François Duval, Arnaud François, Romy Razakandrainibe, Jean Jacques Ballet, Marc Muraine, Loïc Favennec
Background: Acanthamoeba keratitis (AK) is a sight-threatening infectious disease. Its effective and safe medical therapy remains highly debated. Recently, voriconazole, a monotriazole with noted in vitro activity against a large variety of fungi, has been successfully used both topically and systemically to treat human AK cases. Objectives: To measure anti-Acanthamoeba polyphaga in vitro activity, anti-rat AK efficiency and rat cornea penetration of eye-drop and oral voriconazole...
March 27, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29580956/the-use-of-miltefosine-in-the-management-of-refractory-acanthamoeba-keratitis
#6
Shokufeh Tavassoli, Miranda Buckle, Derek Tole, Peter Chiodini, Kieren Darcy
Acanthamoeba keratitis (AK) is a sight threatening infection most commonly affecting contact lens wearers. The authors report a case of intractable A.polyphaga and A.castellanii, with extensive intraocular spread, managed using oral miltefosine. A 59-year old male contact lens wearer was referred to the tertiary corneal service at Bristol Eye Hospital. Vision was hand movements on the left and 6/6 on the right. Clinical examination was consistent with left AK (confirmed by corneal scrape). Management included biguanide (polyhexamethylene biguanide (PHMB) 0...
March 23, 2018: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29580152/epidemiology-risk-factors-and-clinical-outcomes-in-severe-microbial-keratitis-in-south-india
#7
Jaya Devi Chidambaram, Namperumalsamy Venkatesh Prajna, Palepu Srikanthi, Shruti Lanjewar, Manisha Shah, Shanmugam Elakkiya, Prajna Lalitha, Matthew J Burton
PURPOSE: Here, we report risk factors associated with outcome in severe bacterial keratitis (BK), fungal keratitis (FK), and Acanthamoeba keratitis (AK) in India. METHODS: Prospective observational cohort study conducted in Aravind Eye Hospital, India. Adults presenting with severe microbial keratitis (MK) were enrolled (size ≥3 mm) and followed to 21 days post-enrolment. Ulcer clinical features were recorded at presentation. Outcomes by final visit were classified as good (completely healed or reduced infiltrate size) or poor (enlarged infiltrate size, perforated, or surgery performed)...
March 26, 2018: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/29554009/case-report-acanthamoeba-keratitis-management-in-a-first-trimester-pregnant-patient
#8
Francisco de Borja Domínguez-Serrano, Manuel Caro-Magdaleno, Rafael Perea-Pérez, Enrique Rodríguez-de-la-Rúa, Jesús Montero-Iruzubieta
SIGNIFICANCE: Lacrimal punctal plugs may prevent the teratogenicity of the treatment used in infectious keratitis. Its use should be strongly considered in these cases. PURPOSE: We present the case of a 7-week pregnant patient with Acanthamoeba keratitis. CASE REPORT: The patient was a contact lens user with photophobia, redness, and intense pain in the right eye that started 2 weeks earlier. Corrected visual acuity was 20/63 (0.5 logMAR)...
March 16, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29550185/in-vivo-confocal-microscopy-cellular-features-of-host-and-organism-in-bacterial-fungal-and-acanthamoeba-keratitis
#9
Jaya D Chidambaram, Namperumalsamy V Prajna, Srikanthi Palepu, Shruti Lanjewar, Manisha Shah, Shanmugam Elakkiya, David Macleod, Prajna Lalitha, Matthew J Burton
PURPOSE: To determine cellular features of fungal (FK), Acanthamoeba (AK) and bacterial keratitis (BK) using HRT3 in vivo confocal microscopy (IVCM). DESIGN: Prospective observational cross-sectional study. METHODS: Eligible participants were adults with microbiologically-positive FK, AK or BK, of size ≥3mm attending Aravind Eye Hospital from Feb 2012 to Feb 2013. EXCLUSION CRITERIA: descemetocele, perforation. At presentation, IVCM imaging was performed, then corneal scrapes obtained for culture/light microscopy...
March 14, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29532218/acanthamoeba-of-three-morphological-groups-and-distinct-genotypes-exhibit-variable-and-weakly-inter-related-physiological-properties
#10
Cynara Oliveira Possamai, Ana Carolina Loss, Adriana Oliveira Costa, Aloisio Falqueto, Cinthia Furst
Free-living amoeba of the genus Acanthamoeba can eventually act as parasites, causing infections in humans. Some physiological characteristics of Acanthamoeba have been related to the grade of pathogenicity, allowing inferences about the pathogenic potential. The main goal of this study was to characterize isolates of Acanthamoeba obtained in Brazil and evaluate properties associated with their pathogenicity. A total of 39 isolates obtained from keratitis cases (n = 16) and environmental sources (n = 23) were classified into morphological groups and genotyped by sequencing the 18S rDNA fragments ASA...
March 12, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29505068/regional-spread-of-contact-lens-related-acanthamoeba-keratitis-in-italy
#11
Alberto Antonelli, Eleonora Favuzza, Angelo Galano, Margherita Montalbano Di Filippo, Nunziata Ciccone, Federica Berrilli, Rita Mencucci, David Di Cave, Gian Maria Rossolini
Acanthamoeba ocular infections, known as Acanthamoeba keratitis, are an emerging problem among contact lens wearers. Infections mediated by Acanthamoeba are uncommon, but they can be underestimated due to poor awareness and delayed diagnosis. The routine use of rapid and cost-effective molecular methods like Real Time PCR for the diagnosis of this important pathogen could improve diagnosis and therapy outcome. This report describes the detection by Real Time PCR assay of six T4 and one T3 Acanthamoeba infections, as the first reported cases in Tuscany, Italy...
January 2018: New Microbiologica
https://www.readbyqxmd.com/read/29501695/detection-and-molecular-characterization-of-acanthamoeba-spp-in-stray-cats-from-madrid-spain
#12
Ana Montoya, Guadalupe Miró, José María Saugar, Beatriz Fernández, Rocío Checa, Rosa Gálvez, Begoña Bailo, Valentina Marino, José E Piñero, Jacob Lorenzo-Morales, Isabel Fuentes
Acanthamoeba spp. is a widespread protozoan that has been isolated from air, dust, soil, water and biological samples. An opportunistic pathogen of humans and animals, it may cause ocular keratitis, encephalitis, and even multisystem disease. The frequency of Acanthamoeba in animals is unknown. The aim of present study was determine the presence of Acanthamoeba spp. in immunocompromised stray cats - animals possibly more likely to harbour the infection given their immunocompromised status and frequenting of contaminated environments...
March 1, 2018: Experimental Parasitology
https://www.readbyqxmd.com/read/29500874/high-resolution-label-free-two-photon-imaging-of-diseased-human-corneas
#13
Ana Batista, Hans Georg Breunig, Aisada König, Andreas Schindele, Tobias Hager, Berthold Seitz, Karsten König
The diagnosis of corneal diseases may be improved by monitoring the metabolism of cells and the structural organization of the stroma using two-photon imaging (TPI). We used TPI to assess the differences between nonpathological (NP) human corneas and corneas diagnosed with either keratoconus, Acanthamoeba keratitis, or stromal corneal scars. Images were acquired using a custom-built five-dimensional laser-scanning microscope with a broadband sub-15 femtosecond near-infrared pulsed excitation laser and a 16-channel photomultiplier tube detector in combination with a time-correlated single photon counting module...
March 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29490392/-microbial-keratitis-part-2-specific-aspects-of-mycotic-and-acanthamoeba-keratitis
#14
Ingo Schmack, Michael Müller, Thomas Kohnen
No abstract text is available yet for this article.
February 28, 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29490391/-microbial-keratitis-understand-recognize-and-treat-part-1-general-aspects-and-characteristics-of-bacterial-keratitis
#15
Ingo Schmack, Michael Müller, Thomas Kohnen
Infectious inflammation of the cornea (microbial keratitis) represents a potentially vision threatening disease. Depending on the infectious agent and the course of the disease it can result in a complete loss of the involved eye. Early diagnosis and accurate treatment are mandatory to maintain a sufficient visual acuity. The purpose of this review is to highlight and discuss characteristic clinical features, diagnostic procedures, and therapeutic aspects of three major forms of microbial keratitis (bacteria, fungi, and acanthamoeba; the latter two in the 2nd part of this article)...
February 28, 2018: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29471697/first-report-of-acanthamoeba-genotype-t8-human-keratitis
#16
Erika Orosz, Nóra Szentmáry, Huba J Kiss, Ágnes Farkas, István Kucsera, Zoltán Zsolt Nagy
Acanthamoeba has a worldwide distribution in the environment and it is capable of causing a painful sight-threatening disease of the cornea designated as Acanthamoeba keratitis (AK). Nowadays, the cases of AK have surged all over the world along with its disease burden due to increasing use of contact lenses used not only for optical correction but also for cosmetic purposes. In our present work, epithelial abrasion of a 27-year-old female soft contact lens wearer with keratitis was examined. Genotype identification was carried out with a real-time fluorescence resonance energy transfer polymerase chain reaction (PCR) assay based on sequence analysis of the 18S rRNA gene...
February 23, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29462055/tap-water-and-risk-of-acanthamoeba-keratitis-in-rigid-gas-permeable-lens-wearers-sacred-cow-or-culprit
#17
Dmitry S Mirsayafov, Timothy G Albert, Andrei N Shmakov, Polina V Asitinskaya
No abstract text is available yet for this article.
March 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29429293/-deep-anterior-lamellar-keratoplasty-combined-with-antiviral-therapy-in-the-treatment-of-severe-herpes-necrotizing-stromal-keratitis
#18
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
#19
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
#20
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)
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