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Microbial keratitis

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https://www.readbyqxmd.com/read/28317680/risk-for-microbial-keratitis-comparative-metaanalysis-of-contact-lens-wearers-and-post-laser-in-situ-keratomileusis-patients
#1
Jordan Masters, Mehmet Kocak, Aaron Waite
PURPOSE: To compare the risk for microbial keratitis in contact lens wearers stratified by wear schedule with the risk after laser in situ keratomileusis (LASIK). SETTING: Hamilton Eye Institute and Department of Ophthalmology, University of Tennessee Health Science Center, Memphis, Tennessee, USA. DESIGN: Comparative metaanalysis and literature review. METHODS: An extensive literature search was performed in the PubMed database between December 2014 and July 2015...
January 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28298316/paediatric-infectious-keratitis-a-case-series-of-107-children-presenting-to-a-tertiary-referral-centre
#2
Julia Dutra Rossetto, Kara M Cavuoto, Carla J Osigian, Ta Chen Peter Chang, Darlene Miller, Hilda Capo, Oriel Spierer
BACKGROUND/AIMS: Corneal ulcers can result in severe visual impairment in children. The recent trends of paediatric microbial ulcerative keratitis in the USA are unknown. The purpose of this study is to report the risk factors, microbiological profile and treatment outcomes of paediatric microbial keratitis in South Florida. METHODS: A university-based tertiary eye care centre retrospective case series between 1992 and 2015. Medical records of 107 paediatric patients (age <18 years) with the diagnosis of microbial ulcerative keratitis were analysed...
March 15, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28295595/optometry-australia-scope-of-practice-survey-2015
#3
Patricia M Kiely, Skye Cappuccio, Ellen McIntyre
BACKGROUND: This paper presents results from the inaugural Scope of Practice Survey of Optometry Australia members conducted in October 2015. The survey gathered information related to confidence in detecting and diagnosing key ocular conditions, grading diabetic retinopathy, prescribing scheduled medicines, access to equipment, confidence using equipment, incidence of patients requiring therapeutic management, referral practices and services provided. METHODS: The survey was developed, piloted, modified and administered to members of Optometry Australia (excluding student and retired members), who had a current email address...
March 13, 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/28151861/shifting-trends-in-microbial-keratitis-following-penetrating-keratoplasty-in-taiwan
#4
Hung-Chi Chen, Chia-Yi Lee, Hung-Yu Lin, David Hui-Kang Ma, Phil Yeong-Fong Chen, Ching-Hsi Hsiao, Hsin-Chiung Lin, Lung-Kun Yeh, Hsin-Yuan Tan
To investigate the clinical and microbiological profiles from microbial keratitis following penetrating keratoplasty (PKP) in a tertiary referral center in Taiwan, the medical records of 648 consecutive patients (648 eyes) undergoing PKP between January 2003 and December 2007 were retrospectively reviewed. Patients who subsequently sustained microbial keratitis were enrolled and analyzed for potential risk factors, clinical manifestations, microbiological profiles, complications, graft survival, and final visual outcome...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28013522/methods-for-in-vivo-ex-vivo-analysis-of-antimicrobial-peptides-in-bacterial-keratitis-sirna-knockdown-colony-counts-myeloperoxidase-immunostaining-and-rt-pcr-assays
#5
Satya Sree Kolar, Hasna Baidouri, Maria Luisa Mangoni, Alison M McDermott
Antimicrobial peptides (AMPs) are essential components of the innate immune response. They have direct killing ability as well as immunomodulatory functions. Here, we describe techniques to identify specific AMPs involved in the protection against microbial keratitis, a vision threatening infection of the cornea of the eye which is the most serious complication of contact lens wear. Specifically we detail the use of siRNA technology to temporarily knockdown AMP expression at the murine ocular surface in vivo and then describe ex vivo assays to determine the level of bacteria, relative number of neutrophils, and levels of cytokines, chemokines, and AMPs in infected corneas...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27998732/pathogenesis-of-microbial-keratitis
#6
REVIEW
Sahreena Lakhundi, Ruqaiyyah Siddiqui, Naveed Ahmed Khan
Microbial keratitis is a sight-threatening ocular infection caused by bacteria, fungi, and protist pathogens. Epithelial defects and injuries are key predisposing factors making the eye susceptible to corneal pathogens. Among bacterial pathogens, the most common agents responsible for keratitis include Staphylococcus aureus, Pseudomonas aeruginosa, Streptococcus pneumonia and Serratia species. Fungal agents of corneal infections include both filamentous as well as yeast, including Fusarium, Aspergillus, Phaeohyphomycetes, Curvularia, Paecilomyces, Scedosporium and Candida species, while in protists, Acanthamoeba spp...
March 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27994804/microbial-profile-of-corneal-ulcers-in-a-tertiary-care-hospital-in-south-india
#7
Chittur Y Ranjini, Vishnu V Waddepally
PURPOSE: To identify the prevalence and microbial profile of infectious keratitis in a tertiary eye care hospital, and to test for the in vitro antimicrobial resistance of the bacterial isolates. METHODS: A total of 312 patients presenting to a tertiary eye care hospital with infected corneal ulcer were enrolled in this study. Their socio-demographic data and risk factors were recorded. Corneal scrapings collected from the edge of the ulcer were processed for direct gram stain and KOH mount...
October 2016: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/27994401/streptococcus-agalactiae-endophthalmitis-in-boston-keratoprosthesis-in-a-patient-with-steven-johnson-syndrome
#8
Humoud M Al-Otaibi, Mohammed Talea, Omar Kirat, Donald U Stone, William N May, Igor Kozak
A 25-year-old Syrian male with a previous episode of Stevens-Johnson syndrome with bilateral corneal cicatrization previously underwent surgery for Type 1 Boston Keratoprosthesis (K-Pro). Sixteen months after the K-Pro surgery, the patient presented with decreased vision to hand motion and microbial keratitis of the graft around the K-Pro with purulent discharge. Corneal scrapings were nonrevealing. B-scan in 3 days showed increased debris in the vitreous cavity and thickened retinochoroidal layer. Intravitreal tap and injections of vancomycin and ceftazidime were performed...
October 2016: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/27989423/-diagnostic-and-therapeutic-contribution-of-microbiological-analysis-in-severe-microbial-keratitis-at-reims-university-hospital-between-2012%C3%A2-and-2014
#9
J Caliot, D Guindolet, A Ducasse, L Andreoletti, C Arndt
PURPOSE: To investigate the contribution of microbial analysis in the diagnosis and management of severe microbial keratitis. MATERIAL AND METHOD: This is a monocentric retrospective study at the University Hospital of Reims from January 2012 to December 2014. Corneal scrapings with infectious keratitis were subjected to routine bacterial and fungal culture. PCR was also performed to detect various viral DNA (VZV, CMV, EBV, HSV 1 & 2, adenovirus) and Acanthamoeba sp...
December 15, 2016: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/27987408/label-free-electrical-sensing-of-bacteria-in-eye-wash-samples-a-step-towards-point-of-care-detection-of-pathogens-in-patients-with-infectious-keratitis
#10
Hardik J Pandya, Manoj Kumar Kanakasabapathy, Saloni Verma, Manjyot Kaur Chug, Adnan Memic, Mihaela Gadjeva, Hadi Shafiee
The diagnosis of keratitis is based on visual exam, tissue cytology, and standard microbial culturing to determine the type of the infectious pathogen. To prescribe appropriate therapy, it is important to distinguish between bacterial, fungal, and viral keratitis, as the treatments are quite different. Diagnosis of the causative organism has a substantial prognostic importance. Further, timely knowledge of the nature of the pathogen is also critical to adapt therapy in patients unresponsive to empiric treatment options, which occurs in 10% of all cases...
May 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27982205/microbiological-and-epidemiological-study-of-infectious-keratitis-in-children-and-adolescents
#11
Maria Cecilia Zorat Yu, Ana Luisa Höfling-Lima, Guilherme Henrique Campos Furtado
Purpose: To analyze epidemiological and microbiological aspects of microbial keratitis in children and adolescents. Methods: This retrospective cohort study was conducted at the Department of Ophthalmology and Visual Science, Escola Paulista de Medicina, Universidade Federal de São Paulo, between July 15, 1975, and December 31, 2010. We analyzed corneal samples from 859 patients with clinical suspicion of infectious keratitis, comparing epidemiological and microbiological characteristics of bacterial keratitis with those of non-bacterial and non-viral keratitis...
September 2016: Arquivos Brasileiros de Oftalmologia
https://www.readbyqxmd.com/read/27960579/genus-distribution-of-bacteria-and-fungi-associated-with-keratitis-in-a-large-eye-center-located-in-southern-china
#12
Lixia Lin, Weizhong Lan, Bingsheng Lou, Hongmin Ke, Yuanzhe Yang, Xiaofeng Lin, Lingyi Liang
PURPOSE: To investigate the genus distribution of bacteria and fungi associated with keratitis in a large eye center located in Southern China and to compare the results with existing data from other areas in China. METHODS: All results of corneal microbiological examinations from 2009 to 2013 of patients who had been clinically diagnosed with bacterial or fungal keratitis were obtained chronologically and anonymously from the microbiology database at Zhongshan Ophthalmic Center...
April 2017: Ophthalmic Epidemiology
https://www.readbyqxmd.com/read/27877016/clinical-utility-of-antimicrobial-susceptibility-measurement-plate-covering-formulated-concentrations-of-various-ophthalmic-antimicrobial-drugs
#13
Norihiko Tou, Ryohei Nejima, Yoshifumi Ikeda, Yuichi Hori, Kaoru Araki-Sasaki, Kazunori Miyata, Yoshitsugu Inoue, Akihiko Tawara
PURPOSE: The purpose of this study was to evaluate the clinical utility of SG17, an ophthalmic antimicrobial susceptibility measurement plate. DESIGN: This was a multicenter, retrospective, observational study. PATIENTS AND METHODS: Using clinical isolates from patients with ocular infections, drug susceptibility testing using the Clinical Laboratory and Standards Institute standards was routinely conducted at five facilities. The minimum inhibitory concentrations of the isolated strains were determined using SG17 at the Research Foundation for Microbial Diseases of Osaka University...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27844206/ex-vivo-rabbit-and-human-corneas-as-models-for-bacterial-and-fungal-keratitis
#14
Abigail Pinnock, Nagaveni Shivshetty, Sanhita Roy, Stephen Rimmer, Ian Douglas, Sheila MacNeil, Prashant Garg
PURPOSE: In the study of microbial keratitis, in vivo animal models often require a large number of animals, and in vitro monolayer cell culture does not maintain the three-dimensional structure of the tissues or cell-to-cell communication of in vivo models. Here, we propose reproducible ex vivo models of single- and dual-infection keratitis as an alternative to in vivo and in vitro models. METHODS: Excised rabbit and human corneoscleral rims maintained in organ culture were infected using 10(8) cells of Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans or Fusarium solani...
February 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27806431/contact-lens-wear-is-intrinsically-inflammatory
#15
REVIEW
Nathan Efron
Eye-care practitioners typically associate ocular inflammation during contact lens wear with serious complications such as microbial keratitis; however, more subtle mechanisms may be at play. This paper tests the notion that contact lens wear is intrinsically inflammatory by exploring whether uncomplicated contact lens wear meets the classical, clinical definition of inflammation - rubor (redness), calor (heat), tumor (swelling), dolor (pain) and functio laesa (loss of function) - as well as the contemporary, sub-clinical definition of inflammation (cellular and biochemical reactions)...
January 2017: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/27768798/melimine-coated-antimicrobial-contact-lenses-reduce-microbial-keratitis-in-an-animal-model
#16
Debarun Dutta, Ajay K Vijay, Naresh Kumar, Mark D P Willcox
Purpose: To determine the ability of antimicrobial peptide melimine-coated contact lenses to reduce the incidence of microbial keratitis (MK) in a rabbit model of contact lens wear. Methods: In vitro antimicrobial activity of melimine-coated contact lenses was determined against Pseudomonas aeruginosa by viable count and a radiolabeled assay. The amount of lipopolysaccharide (LPS) associated with bacteria bound to melimine-coated and control lenses was determined...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27755163/epidemiology-and-outcome-of-microbial-keratitis-private-university-versus-urban-public-hospital-care
#17
David T Truong, Minh-Thuy Bui, H Dwight Cavanagh
PURPOSE: To review the epidemiology, risk factors, microbiologic spectrum, and treatment of microbial keratitis during a 5-year period at an urban public hospital in comparison with an adjacent private university practice. METHODS: Retrospective chart review in the 5-year interval, 2009 through 2014. Primary outcome measures included patient age at presentation, best-corrected visual acuity (BCVA), risk factors, culture and sensitivities, treatment, and complication occurrence...
October 7, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27738866/the-comparison-of-antimicrobial-effectiveness-of-contact-lens-solutions
#18
Ali Kal, Mustafa Ilker Toker, Serpil Kaya
PURPOSE: The aim of this study was to compare the effects of widely used multipurpose contact lens solutions against Staphylococcus aureus and Pseudomonas aeruginosa, in addition to cystic and trophozoite forms of Acanthamoeba castellanii and A. polyphaga, that cause microbial keratitis. METHODS: Three multipurpose solutions were tested: SOLO-care, ReNu, and Opti-Free Express. The test solutions were challenged with P. aeruginosa (ATCC 27853) and S. aureus (ATCC 2913) based on the ISO stand-alone and regiment test procedure for disinfecting products, A...
October 13, 2016: International Ophthalmology
https://www.readbyqxmd.com/read/27688289/ocular-toxicity-by-seeds-of-annona-squamosa-custard-apple
#19
Harsha Nagaraja, Thungappa Kugar, Yathish Shivanna, Archita Agrawal, Rohit Shetty
Custard apple seeds have been used in native medicine from time immemorial for the management of head lice and skin exfoliation. We report six consecutive patients who developed toxic keratoconjunctivitis within 6-12 h of ocular exposure to custard apple seeds. The use of topical steroid worsens the toxicity and predisposes to the development of microbial keratitis in such cases. Patients showed a good response to primary treatment with topical fortified antibiotics and lubricants. This case series highlights the need to educate the patients regarding the potential toxic effects of the custard seeds and the treating physicians about possible deleterious effects on using topical steroid...
August 2016: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/27590660/identification-of-pathogenic-factors-potentially-involved-in-staphylococcus-aureus-keratitis-using-proteomics
#20
Shamila Khan, Nerida Cole, Emma B H Hume, Linda L Garthwaite, Terry Nguyen-Khuong, Bradley J Walsh, Mark D P Willcox
Staphylococcus is a leading cause of microbial keratitis, characterized by destruction of the cornea by bacterial exoproteins and host-associated factors. The aim of this study was to compare extracellular and cell-associated proteins produced by two different isolates of S. aureus, a virulent clinical isolate (Staph 38) and a laboratory strain (Staphylococcus aureus 8325-4) of weaker virulence in the mouse keratitis model. Proteins were analyzed using 2D polyacrylamide gel electrophoresis and identified by subsequent mass spectrometry...
October 2016: Experimental Eye Research
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