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Microbiology keratitis

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https://www.readbyqxmd.com/read/29757853/multiplex-polymerase-chain-reaction-assay-for-screening-of-mycotoxin-genes-from-ocular-isolates-of-fusarium-species
#1
Orapin Anutarapongpan, Jorge Maestre-Mesa, Eduardo C Alfonso, Terrence P OʼBrien, Darlene Miller
PURPOSE: To identify mycotoxin genes among clinical ocular isolates of Fusarium species and to correlate these with clinical outcomes of Fusarium keratitis. METHODS: Fifty-four clinical isolates of Fusarium were retrieved from the Bascom Palmer Eye Institute Ocular Microbiology Laboratory data bank. Multiplex polymerase chain reactions were run to confirm the identification of Fusarium species [internal transcribed spacer sequence, translation elongation factor 1-α (TEF) and β-tubulin] and to detect the presence of genes encoding production of fumonisin B mycotoxins (FUM1 and FUM8) and trichothecene mycotoxins (deoxynivalenol and nivalenol)...
May 1, 2018: Cornea
https://www.readbyqxmd.com/read/29730068/biofilm-testing-of-microbiota-an-essential-step-during-corneal-scrap-examination-in-egyptian-acanthamoebic-keratitis-cases
#2
Marwa A Hasby Saad, Haidy S M Khalil
PURPOSE: To detect co-infections in the culture-proven acanthamoebic keratitis (AK) cases, and to test the capability of biofilm formation in the isolated microbiota. The clinical findings, habit of wearing contact lens and in-vitro antibiotic resistance were analyzed further according to the biofilm formation capability. METHODS: After clinical examination, corneal scraps and swabs were taken from 240 clinically suspected AK cases, for Acanthamoeba and microbiological cultures...
May 3, 2018: Parasitology International
https://www.readbyqxmd.com/read/29682408/stability-of-an-ophthalmic-formulation-of-polyhexamethylene-biguanide-in-gamma-sterilized-and-ethylene-oxide-sterilized-low-density-polyethylene-multidose-eyedroppers
#3
Yassine Bouattour, Philip Chennell, Mathieu Wasiak, Mireille Jouannet, Valérie Sautou
Background: Polyhexamethylene biguanide (PHMB) eye drops are a frequently used medication to treat Acanthamoeba keratitis. In the absence of marketed PHMB eye drops, pharmacy-compounding units are needed to prepare this much needed treatment, but the lack of validated PHMB stability data severely limits their conservation by imposing short expiration dates after preparation. In this study we aim to assess the physicochemical and microbiological stability of a 0.2 mg/mL PHMB eye drop formulation stored in two kinds of polyethylene bottles at two different temperatures...
2018: PeerJ
https://www.readbyqxmd.com/read/29622703/immune-stromal-keratitis-a-rare-ocular-presentation-of-tuberculosis
#4
Deepali Singhal, Prafulla Kumar Maharana, Namrata Sharma, Jeewan S Titiyal
An 11-year-old female patient presented with diminution of vision in both the eyes for the last 4 days. She had redness, watering and photophobia for the past 11 days. Slit lamp examination revealed multiple disc-shaped corneal stromal infiltrates with an overlying epithelial defect and hypopyon in both the eyes. A provisional diagnosis of infective keratitis was made. The patient was started on empirical antimicrobial therapy. However, no improvement was noted over the next 72 hours. Microbiological examination of the corneal scraping from both the eyes was negative...
April 5, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29580152/epidemiology-risk-factors-and-clinical-outcomes-in-severe-microbial-keratitis-in-south-india
#5
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/29550185/in-vivo-confocal-microscopy-cellular-features-of-host-and-organism-in-bacterial-fungal-and-acanthamoeba-keratitis
#6
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/29459431/comparative-activity-of-antimicrobials-against-pseudomonas-aeruginosa-achromobacter-xylosoxidans-and-stenotrophomonas-maltophilia-keratitis-isolates
#7
Oriel Spierer, Darlene Miller, Terrence P O'Brien
BACKGROUND/AIMS: Achromobacter xylosoxidans and Stenotrophomonas maltophilia are emerging corneal pathogens, which are closely related to Pseudomonas aeruginosa , and have intrinsic resistance to many commonly available antimicrobials. The purpose of this study is to compare the in vitro efficacy of 12 antimicrobial agents against A. xylosoxidans , S. maltophilia and P. aeruginosa isolates recovered from clinical cases of keratitis. METHODS: Recovered corneal isolates (n=58) were identified and extracted from the Microbiology Data Bank of the Bascom Palmer Eye Institute...
May 2018: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29371064/metagenomic-analysis-for-detecting-fusarium-solani-in-a-case-of-fungal-keratitis
#8
Chika Shigeyasu, Masakazu Yamada, Kotaro Aoki, Yoshikazu Ishii, Kazuhiro Tateda, Takashi Yaguchi, Yukinobu Okajima, Yuichi Hori
PURPOSE: To report a difficult-to-identify case of keratitis due to Fusarium solani, diagnosed with the help of exhaustive gene analysis. CASE: A 47-year-old woman attended our hospital with a refractory corneal ulcer associated with contact lens wear in her left eye that had appeared two weeks earlier. On her initial visit, slit lamp examination revealed a small double-ringed irregular hyphate ulcer in the center of the cornea, which had no epithelial defect, suggesting fungal infection...
January 20, 2018: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/29369229/stenotrophomonas-maltophilia-a-case-series-of-a-rare-keratitis-affecting-patients-with-bandage-contact-lens
#9
Henry D J Hogg, We Fong Siah, Arthur Okonkwo, Manjusha Narayanan, Francisco C Figueiredo
OBJECTIVES: Stenotrophomonas maltophilia is an opportunistic pathogen known to form biofilms on contact lens and case surfaces that may result in permanent visual loss in cases of microbial keratitis. Because of its multiple drug resistance and extremely low incidence, there is little consensus on treatment. We investigated the predisposing factors, management, and visual outcomes in a small case series of patients to better inform the management of this rarely reported keratitis. METHODS: Retrospective analysis of medical records was performed at a single tertiary referral center between 2011 and 2017...
January 22, 2018: Eye & Contact Lens
https://www.readbyqxmd.com/read/29360230/capnocytophaga-keratitis-in-dogs-clinical-histopathologic-and-microbiologic-features-of-seven-cases
#10
Eric C Ledbetter, Rebecca J Franklin-Guild, Michele L Edelmann
OBJECTIVE: To describe the clinical, microbiologic, and histopathologic features of Capnocytophaga keratitis in dogs. ANIMALS STUDIED: Seven dogs with naturally acquired Capnocytophaga keratitis. PROCEDURES: Medical records of dogs with a clinical diagnosis of keratitis and corneal cultures positive for Capnocytophaga spp. were reviewed. Dog signalment, medical history, clinical findings, and diagnostic assay results were recorded. RESULTS: Breeds included Boston terrier (n = 3 dogs), Rat terrier (n = 2), and single cases of mixed breed and Pug...
January 23, 2018: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29340642/identifying-corneal-infections-in-formalin-fixed-specimens-using-next-generation-sequencing
#11
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/29338721/infectious-keratoconjunctivitis-in-semi-domesticated-eurasian-tundra-reindeer-rangifer-tarandus-tarandus-microbiological-study-of-clinically-affected-and-unaffected-animals-with-special-reference-to-cervid-herpesvirus-2
#12
Javier Sánchez Romano, Torill Mørk, Sauli Laaksonen, Erik Ågren, Ingebjørg H Nymo, Marianne Sunde, Morten Tryland
BACKGROUND: Infectious keratoconjunctivitis (IKC) is one of the most common ocular diseases in ruminants worldwide. In addition to keratitis and conjunctivitis, animals with IKC can develop uveitis, corneal ulcer, and in severe cases, blindness. The bacteria Moraxella spp. has been described as the primary causative agent of infectious bovine keratoconjunctivitis (IBK) in cattle (Bos taurus), while Chlamydia spp. and Mycoplasma conjunctivae are considered the main causative agents of IKC in sheep (Ovis aries)...
January 16, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29300262/accelerated-corneal-cross-linking-with-photoactivated-chromophore-for-moderate-therapy-resistant-infectious-keratitis
#13
Boris Knyazer, Yonit Krakauer, Yael Baumfeld, Tova Lifshitz, Sabine Kling, Farhad Hafezi
PURPOSE: To evaluate the effect of accelerated corneal cross-linking with photoactivated chromophore (PACK-CXL) as additional treatment for therapy-resistant infectious keratitis. METHODS: In this interventional cohort study, 20 patients (11 men and 9 women), aged 65.5 (interquartile range = 21.5-78.5) years, who were hospitalized for moderate-sized therapy-resistant bacterial corneal ulcers (11/20 microbiologically confirmed) were treated with hypoosmolar 0.1% riboflavin solution and Ultraviolet A (UVA) irradiation for 3 minutes at 30 mW/cm (5...
April 2018: Cornea
https://www.readbyqxmd.com/read/29279602/new-therapeutic-perceptions-in-a-patient-with-complicated-herpes-simplex-virus-1-keratitis-a-case-report-and-review-of-the-literature
#14
REVIEW
Dimitrios Kalogeropoulos, Aliki Geka, Konstantinos Malamos, Maria Kanari, Chris Kalogeropoulos
BACKGROUND Keratitis caused by herpes simplex virus (HSV) can have detrimental effects on the cornea leading to loss of vision. Modern therapies can contribute to the prevention of anatomical and functional damage. CASE REPORT An 80-year-old male with complicated HSV-1 keratitis of the left eye (confirmed diagnosis after microbiological investigation) presented three months after antiviral treatment with corneal blurring, severe epitheliopathy, thinning of the stroma, and neovascularization. At the time he was referred, the visual acuity of his left eye was very low, as he could only count fingers at a one-foot distance...
December 27, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/29193858/exophiala-phaeomuriformis-keratitis-in-a-subarctic-climate-region-a-case-report
#15
André Vicente, Fátima Pedrosa Domellöf, Berit Byström
PURPOSE: To report a case of Exophiala phaeomuriformis mycotic keratitis in a patient from a subarctic climate region. Dematiaceous fungi (black yeasts) have been gaining importance as corneal keratitis and ulcer causative agents in certain regions, but no cases have been described in Scandinavia. METHODS: Case report of a patient with a persistent corneal erosion that eventually presented a brown-pigmented infiltrate. The patient had a history of several months of topical therapy comprising medication for glaucoma, corticosteroids and antibiotics...
November 29, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29150218/keratitis-secondary-to-fusarium-spp-in-spain-2012-2014
#16
M A Mosquera Gordillo, N Barón Cano, A Garralda Luquin, C López Gutiérrez, E Mengual Verdú, G Trujillo Cabrera, J M Garrido Fierro, J Lamarca Mateu, J C Sánchez España, P Marticorena Álvarez, R Feijoó Lera, S Martín Nalda, T Marti Huguet, V Gacía Conca
OBJECTIVE: To describe the clinical-epidemiological characteristics of a case series of fungal keratitis associated with Fusarium spp.., in Spain during the years 2012 to 2014. METHODS: A retrospective study of a case series was conducted on a systematic random sample of 10% of patients identified in Health Centres of provincial capitals (n=250). The centres were asked whether they had been presented with cases of Fusarium spp. keratitis characterised by microbiological methods...
November 14, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/29133630/non-contact-lens-related-acanthamoeba-keratitis
#17
REVIEW
Prashant Garg, Paavan Kalra, Joveeta Joseph
The purpose of the study is to describe epidemiology, clinical features, diagnosis, and treatment of Acanthamoeba keratitis (AK) with special focus on the disease in nonusers of contact lenses (CLs). This study was a perspective based on authors' experience and review of published literature. AK accounts for 2% of microbiology-proven cases of keratitis. Trauma and exposure to contaminated water are the main predisposing factors for the disease. Association with CLs is seen only in small fraction of cases. Contrary to classical description experience in India suggests that out of proportion pain, ring infiltrate, and radial keratoneuritis are seen in less than a third of cases...
November 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29111996/microbial-keratitis-after-accelerated-corneal-collagen-cross-linking-in-keratoconus
#18
Prafulla K Maharana, Pranita Sahay, M Sujeeth, Deepali Singhal, Anubha Rathi, Jeewan S Titiyal, Namrata Sharma
PURPOSE: To assess the pattern of microbial keratitis after accelerated corneal collagen cross-linkage (aCXL) in patients with keratoconus. METHOD: The medical records of cases of keratoconus that underwent aCXL from June 2014 to May 2017 were reviewed. Cases that developed microbial keratitis after aCXL were included in the study. The clinical, microbiological profile and the treatment outcomes were evaluated. RESULTS: Of 532 eyes that underwent aCXL, 7 cases developed microbial keratitis during the study period...
February 2018: Cornea
https://www.readbyqxmd.com/read/29111995/diagnostic-evaluation-of-co-occurrence-of-acanthamoeba-and-fungi-in-keratitis-a-preliminary-report
#19
Anita Raghavan, Shaffie Baidwal, Prabhu Vijayaraghavan, Sakthi Rajeswari, Revathi Rajaraman, Narendran Venkatapathy, Sunitha Menon, Ram Rammohan
PURPOSE: To test the hypothesis that the coexistence of Acanthamoeba with other forms of microbial keratitis, especially fungal keratitis (FK), is more prevalent than suspected. METHODS: A prospective diagnostic study whereby patients presenting with stromal keratitis were additionally tested for Acanthamoeba, irrespective of the initial diagnosis. In addition to the routine workup with Gram stain, KOH mount, and cultures on blood agar and potato dextrose agar, nonnutrient agar was included...
February 2018: Cornea
https://www.readbyqxmd.com/read/29064157/inflammation-and-oxidative-stress-in-corneal-tissue-in-experimental-keratitis-due-to-fusarium-solani-amelioration-following-topical-therapy-with-voriconazole-and-epigallocatechin-gallate
#20
Vasanthakumar V Ruban, Philip T Archana, Mahalingam Sundararajan, Pitchairaj Geraldine, Philip A Thomas
Combined antifungal and antioxidant therapy may help to reduce oxidative stress in fungal keratitis. Experimental Fusarium solani keratitis was induced by application of F. solani conidia to scarified cornea (right eye) of 16 rabbits (another four rabbits were negative controls [Group I]). Five days later, F. solani-infected animals began receiving hourly topical saline alone (Group II), voriconazole (10 mg/mL) alone (Group III), epigallocatechin gallate (EGCG, 10 mg/mL) alone (Group IV) or voriconazole and EGCG (Group V)...
March 2018: Mycoses
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