Cases Of Infectious Keratitis Research Articles

A single-center study on the distribution and shifting trend of infectious keratitis pathogens from 2018 to 2022

Objective: To investigate the pathogen species, composition, and distribution characteristics of infectious keratitis pathogens in Shandong Province and its surrounding areas. Methods: In this cross-sectional study, patients with keratitis who underwent corneal sampling and microbiological culture at the Shandong Eye Hospital from January 1, 2018 to December 31, 2022 were included. Under topical anesthesia, the edge of the lesion was scraped by an experienced physician. The samples were inoculated on blood agar and Sabouraud dextrose agar plates, separately for bacterial and fungal culture and identification. If necessary, the samples were inoculated on a non-nutrient agar medium with Escherichia coli for Acanthamoeba culture. Bacterial isolates were identified using Vitek 2 compact or matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Fungal isolates were identified based on morphological characteristics or sent to a company for sequencing in cases of difficult identification. The epidemiological data of the patients, pathogen species and number (counting as 1 strain if the same strain was isolated from multiple corneal specimens of the same patient), culture positivity rate, and seasonal distribution were recorded. Differences in pathogen positivity rates among different seasons were analyzed using the chi-square test. Results: Among the 4, 024 patients with infectious keratitis during the study period, there were 2 510 males (62.3%) and 1 514 females (37.6%), aged from 46 days to 94 years. Positive microbial culture results were achieved in 2, 363 patients (58.7%), including 906 cases (38.3%) with bacterial positivity, 1 231 cases (52.1%) with fungal positivity, 28 cases (1.2%) with Acanthamoeba positivity, and 198 cases (8.4%) with mixed fungal and bacterial infections. A total of 2 561 strains were isolated, including 1 104 bacterial strains. The most common bacteria were coagulase-negative Staphylococcus spp. (623/1 104, 56.4%), followed by Streptococcus spp. (131/1 104, 11.9%) and Pseudomonas aeruginosa (68/1 104, 6.2%). The most common fungi were Fusarium spp. (634/1 429, 44.4%), followed by Aspergillus spp. (279/1 429, 19.5%) and Alternaria spp. (229/1 429, 16.0%). Bacterial keratitis was more common in summer and autumn, while fungal keratitis was more common in autumn and winter. Conclusions: Among infectious keratitis cases in Shandong Eye Hospital, Fusarium species were predominant fungal pathogens, while coagulase-negative Staphylococcus predominated in bacterial pathogens. Both fungal and bacterial corneal infections showed seasonal variations.

A Study of Clinico-Microbiological Profile and Treatment Outcomes of Infectious Keratitis.

Background Infectious keratitis (IK) is one of the major causes of corneal blindness in developing and developed nations.Numerous infections, including bacterial, fungal, viral, and protozoa, have been linked to IK. Corneal perforations can happen as one of the complications of IK. In this study, we aim to determine the clinical and microbiological profile and to studythe treatment outcomes of IK. Material and methods It is a prospective, observational, and experimental study conducted in a tertiary care hospital and research centerin Western Maharashtra, India, from September 2022 to June 2024. The sample size was 107 patients with IK. All patients were above 15 years of age, and all cases of microbial keratitis were within the inclusion criteria. Patients less than 15 years of age, patients with any other associated corneal pathology, healed cases of infectious keratitis, peripheral ulcerative keratitis, patients not willing to participate in the study, or not giving consent were excluded. Patients were examined thoroughly, and corneal scraping samples were collected and sent for microbiological examination. Appropriate treatment was provided through medical or surgical management, and treatment outcomes were evaluated during frequent follow-up visits. Results In our study, the majority of patients originated from rural areas, with most being over 60 years of age. Diabetes mellitus was seen in 24.3%, and a history of ocular trauma was present in 48.5% of patients. Staphylococcus epidermidis (3.74%) was the most common organism seen on gram staining, followed by Staphylococcus aureus (2.8%). Pseudomonas aeruginosa was the only gram-negative organism seen. The number of patients who had fungal isolates positive on culture was 57%, 12.1% had bacterial, and 30% had no growth of microorganisms. Fusarium species were seen in 39.2% of culture isolates, followed by Aspergillus flavus and Niger in 7.47% each. In 96% of medically managed patients, ulcers healed within two months. All ulcers with severe and moderate depth required therapeutic penetrating keratoplasty. A graft was in place in 95.2% after therapeutic penetrating keratoplasty, while one patient had graft rejection, and in one patient, endophthalmitis was seen. Conclusion Staphylococcus epidermidiswas the most common bacterial agent isolated on gram staining, and Pseudomonas aeruginosa was the only gram-negative bacillus isolated on gram staining. Fungal isolates were the most common isolates observed on culture, seen in more than half of the IK patients in our study. The majority of patientswho underwent medical management had ulcers healed in two months. The majority of the patients who underwent surgical management had fungal isolates positive.We recommend further research to be conducted in a generalized population, including urban settings, to understand the risk factors, microbiological profile, and treatment outcomes for IK.

Fungal Keratitis in Northwestern Spain: Epidemiology, Risk Factors and Outcomes.

To review the clinical features, risk factors, microbiological profile, and treatment regimens of fungal keratitis in Galicia, a region in Northwestern Spain with temperate humid weather. A retrospective case series was employed, including patients with fungal keratitis from nine hospitals within the region of Galicia, Spain, between 2010 and 2020. Data obtained from clinical records were analysed. Out of 654 cases of infectious keratitis, 77 cases (9.9%) were identified as fungal keratitis. The median age of affected patients was 68.0 years, with a higher incidence in rural areas (62.3%). Candida spp. infections were the most frequent type (55.8%) and were associated with a higher median age than were the non-dermatophyte mould infections. The primary risk factors included steroid eyedrop use (29.9%), recent keratoplasty (18.2%), ocular trauma (19.5%), and contact with vegetable matter (11.7%). Most ulcers displayed stromal involvement, and 37.7% presented corneal thinning. The median duration of infection was longer in fungal than in bacterial keratitis, and surgical intervention was required in 48.1% of cases. Fungal keratitis, mainly involving Candida spp., accounted for 9.9% of microbial keratitis cases in Galicia, Spain, with significant risk factors being topical steroid use, ocular trauma, and contact with vegetable matter. Delayed diagnosis often resulted in poor outcomes, highlighting the need for early detection through awareness and new technologies to improve prognosis.

Fungal keratitis among inpatients with corneal ulcers in Thai Binh, Vietnam: A retrospective observational study

Background: Infectious keratitis can be caused by bacteria, fungi, and viruses. Fungi are a common pathogen, especially in developing countries like India, Nepal, and Bangladesh where the prevalence ranges from 20% to 60%. In Vietnam, fungal keratitis accounted for the highest number of keratitis cases in a study conducted at the central eye hospital over a 5-year period (57%). Therefore, it is necessary to collect specific background information connected to the types of fungal keratitis in corneal ulcer cases in this region. Aims and Objectives: The aim of this study was to investigate the prevalence of fungal keratitis and the epidemiological features in 216 cases of fungal keratitis out of a total of 240 cases of infectious keratitis. Materials and Methods: This retrospective study collected secondary data from medical records of 240 inpatients with infectious keratitis who were treated at the ophthalmology hospital in Thai Binh, Vietnam, from January 01st, 2021 to June 30th, 2022. Patients with a positive fungal-directed smear were analyzed in detail for the type of fungus isolated, sociodemographic data, predisposing risk factors, prior treatment modalities, and laboratory results for the distribution pattern of fungus species. Results: Among the 240 cases, 126 (52.5%) were diagnosed with fungal keratitis by direct microscopic examination. Culture results showed the highest rate of Fusarium spp. (43.3%). The age group of 41–60 years was most commonly involved (40.5%). Males were more affected by fungal keratitis than females, (53.2% compared to 46.8%), with farmers being the most common occupation correlated with fungal keratitis (55.6%). The rate of fungal keratitis patients due to agricultural injuries was the highest compared to other risks (47.6%) and most patients self-medicated before going to the hospital, with many not knowing or remembering what medications they had taken (52.4%). Conclusion: The study revealed a high rate of fungal keratitis among the total of infectious keratitis cases in Thai Binh, Vietnam. Fusarium spp. was the most commonly isolated fungi. The study also highlighted the impact of agricultural injuries on fungal keratitis, especially in regions like Thai Binh.

Frequency and Outcome of Emergency Penetrating Keratoplasty in Infectious Keratitis in Sweden During the 21st Century.

To study the frequency over time and outcome of penetrating keratoplasty (PK), "keratoplasty à chaud," in patients with infectious keratitis with 2-year follow-up data. This register-based study included keratitis cases that had undergone PK in Sweden between 2001 and 2020 and reported to the Swedish Corneal Transplant Register. During the study period, 69 eyes were subjected to acute PK due to progressive infectious keratitis. The number increased from 2 annual procedures in the first half of the study period to 5 in the second half (P = 0.01). Preoperative corneal perforation was present in 43.5% (n = 30) of the eyes. Two years after surgery, follow-up data were completed in the register for 53 eyes; of these, 62.3% (n = 33) were considered to have functioning grafts, and 20.8% (n = 11) had experienced a rejection episode. The visual acuity improved from hand motion to counting fingers (P = 0.002), and the proportion of eyes with a visual acuity of ≤1.0 logMAR increased from 5.7% (n = 3) before the surgery to 45.3% (n = 24) at the 2-year follow-up (P < 0.001). The number of active infectious keratitis cases undergoing keratoplasty à chaud increased in Sweden during the 21st century. Most of the cases were successful regarding the structural integrity of the bulb, that is, "had a saved eye" and even a functioning graft 2 years after corneal transplantation. The visual gain was distinct, albeit modest. In cases with severe infectious keratitis, and even a concomitant perforation in the cornea due to the infection, corneal transplantation should continue to be an option.

Current therapy and advancements in the treatment of equine fungal keratitis.

Equine fungal keratitis represents a substantial portion of keratitis cases in horses, with fungal involvement identified in approximately half of all infectious keratitis cases. Despite its prevalence, more comprehensive retrospective analyses are needed to better understand this condition. Outcomes vary, with approximately two-thirds of cases achieving complete healing with retained vision, although enucleation is often necessary. Predominant pathogens include Aspergillus and Fusarium, with yeast reported in a minority of cases. Resistance to common antifungal agents among filamentous fungi poses a significant challenge. Advances in diagnostics, including repeat culture and antifungal susceptibility testing, as well as the incorporation of PCR technology, hold promise for improving detection and guiding treatment decisions. Newer antifungals, combination therapies, and innovative modalities such as photodynamic therapy offer hope for improved outcomes. Continued research efforts are essential to further elucidate the epidemiology, pathogenesis, and optimal management strategies for this condition.

Phenotypic Screening and Antibiogram of Infectious Ulcerative Keratitis Cases in Tripoli Eye Hospital, Libya

Aims: This study to investigate the most prevalent pathogens that cause corneal ulcer in Tripoli-Libya, and to recognize the antibiogram of the isolated pathogens Study Design: This study was a prospective study performed in eye hospital (Zawyet-Aldahmany eye hospital). Place and Duration of Study: It was conducted at the microbiology laboratory of the hospital over a year from December 2018 to January 2020, The overall size of the sample enrolled in this study was 50 inpatients in the admission department, which was taken according to the incidence of the corneal ulceration cases admitted to the hospital. Methodology: The corneal scrapings and swabs were collected and subjected to microbiological examination. Demographic data and risk factors were collected for each patient. The antibiotic susceptibility of the bacterial microorganisms was determined by the Kirby-Bauer disk diffusion method, to identify the most appropriate antibiotic for each bacterial isolate. Results: 60% of the patients were males, the mean age of the patients was 46.5 years, unilateral right eye keratitis was involved in (54%) of cases, trauma was the major risk factor (24%), followed by systemic disease (14%). Concerning the seasonal distribution of the cases between months, our study revealed that summer and winter seasons in Libya (January, July, August, and September) involved most of the cases, and interestingly, fungal keratitis (Aspergillus) was higher in (July, August), which is the summer season in Libya. The culture positive rate was (80%), of which (36%) were bacterial, and (22%) were fungal pathogens, and the other (22%) were mixed fungal and bacterial cultures. The most common bacterial isolate was (26%) P.aeruginosa and (16%) staphylococcus aureus, while Aspergillus (40%) was the most common fungal isolate, followed by Penicillium and fusarium species. Our results showed that P.aeruginosa was the responsible microorganism for rapid keratitis progression in three cases who were using cosmetic lenses promptly. Concerning antibiotic sensitivity, all gram-negative bacteria and positive isolates were susceptible to old-generation fluoroquinolones such as ciprofloxacin and levofloxacin, while ceftazidime showed resistance to penicillins. Conclusion: In conclusion, with early suspicion and microbiological diagnostic procedures, appropriate therapy can only reduce the incidence of this threatening ocular case.

Five-Year Risk and Safety Profile of Autologous Serum Eye Drop Therapy.

To evaluate the risk and safety profile of autologous serum eye drop therapy in clinical routine over a period of 5 years. This retrospective study involved all patients treated with autologous serum between July 2014 and December 2019 at a tertiary ophthalmic referral center. The electronic patient record system was searched for all patients with autologous serum eye drop therapy at any time point. These records were subsequently searched for keywords such as infectious keratitis, corneal ulcer, conjunctivitis, or endophthalmitis at any recorded contact. The probability of an association between the therapy with autologous serum eye drops and infectious complications was investigated independently by three corneal specialists and rated as likely, potential, or unlikely. In total, 752 patients were treated with autologous serum eye drops between July 2014 and December 2019. There were 5 384 batches with a total of 107 680 bottles of serum eye drops that had been produced and dispensed for these patients during this period. The records of 291 patient showed a combination of autologous serum therapy and at least one keyword for infectious diseases. In 288 patients, individual case analyses revealed an unlikely association between the therapy and infection, as their infectious episodes occurred either before the start of the therapy, more than 1 month after the therapy ceased, or in the contralateral untreated eye in the case of unilateral therapy. Three cases of infectious keratitis were classified as potentially associated with autologous serum therapy. However, all three patients suffered from chronic anterior eye diseases with a high risk of spontaneous infectious complications independent of therapy with autologous eye drops. None of the infectious events was rated as being likely due to the serum eye drops. Serum eye drops are often used in patients with severe or chronic anterior eye diseases with an intrinsic risk of infectious diseases. Despite these preexisting risk factors, autologous serum eye drops can be considered safe, even in patients with a compromised ocular surface.

Ten-year Trends in Infectious Keratitis in South Korea

Purpose: This study investigated the causative microorganisms, antibiotic susceptibility, and risk factors of infectious keratitis over the past 10 years.Methods: Data from patients with infectious keratitis who underwent microbial culture tests from 2012 to 2021, obtained from anonymized data systems, were analyzed. Microbial culture results and antibiotic susceptibility profiles were examined. A retrospective analysis of the medical records of patients with infectious keratitis during the same period was conducted to investigate the clinical characteristics and risk factors.Results: Data from 1,837 cases of infectious keratitis were extracted from anonymized records. The culture positive rate among patients was 46.0% (1,137/2,474), with coagulase-negative &lt;i&gt;Staphylococcus&lt;/i&gt; (CoNS) being the most common causative organism (27.8%). Increased resistance to cefazolin and cefotaxime was observed in gram-negative bacteria, while there were no significant temporal changes in quinolone resistance in gram-positive or negative bacteria. A retrospective medical record analysis of 288 cases revealed that older patients, as well as those with an initial corrected visual acuity &lt; 0.1, a history of ocular surgery, pre-existing ocular conditions, prior steroid eye drops, or glaucoma eye drops, had significantly higher rates of culture positivity. Multivariate analysis identified risk factors for severe keratitis requiring surgical intervention as a symptom-to-presentation period of 7 days or longer (&lt;i&gt;p&lt;/i&gt; = 0.048) and pre-existing ocular conditions (&lt;i&gt;p&lt;/i&gt; = 0.040).Conclusions: CoNS was the most common microorganism causing infectious keratitis over the past decade. There has been an increase in resistance to cephalosporin antibiotics among gram-negative bacteria. Patients with pre-existing ocular conditions may require surgical intervention, so infectious keratitis in these patients requires greater attention.

Microbiological Profile of Infectious Keratitis in a Tertiary Care Hospital

Abstract Background: Microbial keratitis is a major preventable cause of visual impairment. In developed countries viral infections are the leading cause of corneal ulcer whereas bacteria and fungi attributes to maximum number of cases in the developing countries. There is paucity of recent data, risk factors and demographic distribution of patients for all three leading etiological agents of keratitis. Material and Methods: This study included all clinically diagnosed cases of infective keratitis from 01 Jan 2021 to 01 Jan 2022. In brief, four sets of corneal scrapings were taken from patients of infectious keratitis and processed for bacterial and fungal culture, microscopy and RTPCR of viral agents. Results: It was observed that rural elderly males were the most predisposed to occurrence of infectious keratitis and trauma being the leading cause. Out of total 151 samples processed, 49(32%) samples were found to have definitive evidence of bacterial, fungal and viral pathogens. Fungi were found to be the most common 37 (24%) etiological agent leading to keratitis followed by bacterial 7(5%) and viral agents 5(3%). Conclusion: Clinical signs alone are not sufficient to diagnose infectious keratitis, the importance of microbiology in the identification of pathogen and aiming at definitive therapy of infectious keratitis helps in rescuing the eye from this reversible cause of blindness.

Prevention of Ocular Toxicity Using Protective Contact Lenses in Multiple Myeloma Patients Receiving Belantamab Mafodotin, Pomalidomide and Dexamethasone: A Sub-Study of the Cmrg-007 Trial

Background: Belantamab mafodotin (belamaf) is a monomethyl auristatin-F containing antibody drug conjugate that targets BMCA on myeloma cells. Single agent belamaf has shown clinical meaningful activity in relapsed/refractory multiple myeloma (RRMM) but ocular adverse events (AEs) affect 53-72% of trials'participants. In DREAMM-2, prophylactic corticosteroid eye drops did not effectively reduce the risk of keratopathy. It is therefore imperative that strategies to mitigate corneal AEs be explored. This 2-part study is designed to evaluate belamaf and pomalidomide/dexamethasone (Pd) in RRMM. Here we report the efficacy and ocular AEs of patients (pts) receiving 2.5 mg/kg (maximum tolerated dose) or 1.92 mg/kg IV belamaf and administrated on various schedules aimed to define the optimal balance of efficacy and tolerability. We also present results of an ocular sub-study exploring the use of bandage contact lens (BCLs) to reduce the risk and severity of belamaf-associated ocular AEs. Methods: Eligibility: &amp;gt; 1 prior lines of therapy (LoT), lenalidomide, proteasome inhibitors exposed, and refractory to the last LoT. Pd was administered per standard of care and belamaf (1.92 or 2.5 mg/kg) Q4W or 2.5 mg/kg Q8W, Q12W or SPLIT equally on days 1 and 8, Q4W. Pts enrolled on the ocular sub-study received the recommended part two dose (RP2D): 2.5 mg /kg Q8W. A BCL (Bausch and Lomb Pure Vision) was placed in the right (R) eye for the 1st 2 doses of belamaf with the left (L) eye serving as control. Subsequently, BCLs were placed in both eyes. Pts wore BCLs for up to 28 days after each belamaf dose. Evaluation by an eyecare specialist for a comprehensive eye exam and BCL placement occurred every 15-28 days during BCLs use and prior to each belamaf dose. Corneal findings were graded (Gr) by the keratopathy and visual acuity (KVA) scale and findings of local infection were reported. Keratitis prophylaxis during BCLs use included gatifloxacin 0.3% or tobramycin 1.3% eye drops. Results: This analysis comprises 92 pts including 14 on the ocular sub-study. Baseline best corrected visual acuity (BCVA) and ocular comorbidities were similar across all cohorts: with median 20/20 BCVA 46.7% R and 50% L eye. Abnormal fundoscopy was 21.7% in R and 16.3% in L eye. There was a trend to lower incidence and less severity of ocular AEs for the 1.92 mg/kg dose (Table 1). Gr 3-4 keratopathy, decrease in BCVA and subjective Gr &amp;gt;2 blurred vision by CTCAE were 33.3% (4/12), 41.7% (5/12) and 25% (3/12) for the 1.92 mg/kg and 75% (9/12), 75% (9/12) and 33.3% (4/12) for 2.5 mg/kg Q4W cohorts. Preliminary data indicated superior clinical efficacy (ORR, &amp;gt;VGPR rate and mPFS) for the 2.5 mg/kg dose, 100% (12/12), 91.7% (11/12) and 25.1 months (11.8-NYR) versus 66.7% (8/12), 63.6% (7/12) and 16.9 months (5.3-19.7) for the 1.92 mg/kg dose (Table 2). To preserve efficacy but reduce ocular AEs additional cohorts exploring 2.5 mg/kg dosed every 8 and 12 weeks were included. Extended dosing schedules showed lower rates of Gr 3-4 keratopathy, decrease in BCVA, and Gr ≥2 blurred vision: 58.3% (7/12), 91.7% (11/12) and 16.7% (2/12) of pts treated Q8W; and 58.3%, 58.3% and 16.7% (2/12) of pts treated Q12W versus the Q4W schedule. Importantly, the efficacy was preserved with ORRs of 91.7% (11/12) and 100% (11/11), &amp;gt;VGPR rates of 83.3% (10/12) and 63.6% (7/11) and mPFS of 18.3 months (95% CI: 10.1-NYR) and 22.5 (95% CI: 8.9-NYR) for Q8W and Q12W groups, respectively. In the ocular sub-study, assessment of R and L eye during the first 2 belamaf doses showed a significant delay in onset of BCVA decrease in the R eye (p&amp;lt;0.0001) compared to the L. Comparing pts treated at the RP2D, moderate to severe (Gr ≥2) keratopathy and decrease BCVA were significantly lower (p=0.0004 and 0.010), in the BCL cohort versus no-BCL group. Further there was a trend towards less symptomatic blurred vision (p=0.256). BCL pts were able to complete 90% of the pre-planned belamaf cycles compared to 70% in the RP2D no-BCL group (p=0.029). No cases of infectious keratitis were reported in the BCL cohort. Conclusions: Our data suggest that extended dosing intervals may be a significant step forward in mitigating corneal AEs of belamaf. This preliminary report on the efficacy of BCLs in 14 pts demonstrates a decrease in moderate to severe corneal AEs and reduction in dose holds for corneal AEs, noting however a short follow up at this time. The data support the further evaluation of BCLs in preventing belamaf associated ocular toxicities.

Infectious Keratitis After Keratoplasty in the United States: Analysis of a National Medicare Claims Data Set.

The aim of this study was to assess the incidence, trends, and risk factors of infectious keratitis (IK) and subsequent repeat keratoplasty after penetrating keratoplasty (PK) and endothelial keratoplasty (EK). Using a retrospective cohort study design, IK cases within 6 months of keratoplasty were identified using billing codes among 100% Medicare beneficiaries aged 65 years and older who underwent either PK or EK between 2011 and 2020. Multivariable logistic regression models were used to evaluate factors associated with postkeratoplasty IK. We identified 115,588 keratoplasties, of which 20.0% (n = 23,144) were PK and 80.0% (n = 92,444) were EK. IK developed within 6 months with a rate of 3.32% (n = 769) post-PK and 0.72% (n = 666) post-EK. Overall rates of IK decreased from 16.05 to 9.61 per 1000 keratoplasties between 2011 and 2020 ( P < 0.001). The median interval between keratoplasty and diagnosis of IK was 73 days (interquartile range: 29-114 days) for PK and 74 days (interquartile range: 38-116 days) for EK. After IK, 22.9% (n = 176) and 23.8% (n = 159) eyes underwent repeat keratoplasty within 1 year for PK and EK, respectively. The occurrence of IK after PK was associated with age 85 years and older [odds ratio (OR): 1.38; 95% confidence interval (CI): 1.13-1.68] relative to patients aged 65 to 74 years. The occurrence of IK after EK was also associated with age 85 years and older (OR: 1.44; 95% CI: 1.14-1.82) relative to patients aged 65 to 74 years. IK was 4 times more common after PK than EK and the complication was associated with older age. Our findings may help corneal surgeons in counseling patients at higher risk and guiding their postoperative care.

Новые возможности экспресс-диагностики сложно культивируемых возбудителей инфекционных кератитов

Infectious keratitis poses a significant diagnostic challenge due to the diverse range of causative agents involved, including difficult-to-cultivate and atypical pathogens that are often missed by standard identification methods. Purpose. This study aims to present clinical cases where the successful preliminary verification of difficult-to-cultivate pathogens in infectious keratitis was achieved using scanning electron microscopy (SEM) and lantanoid staining. Material and methods. The article describes two cases of infectious keratitis in patients with a special status of the ocular surface, where conventional bacteriological analysis failed to identify the causative agent. Results. The optimal approach to the treatment of patients was chosen taking into account the information obtained from SEM with lanthanide contrast. Conclusion. The results demonstrate the potential of lanthanide staining and SEM as an additional tool for the identification of atypical pathogens in patients with keratitis and concomitant eye diseases. Key words: ocular surface, cornea, keratitis, scanning electron microscopy, microbiome, bacteria, fungi

Rates of infectious keratitis and other ocular surface adverse events in corneal cross-linking for keratoconus and corneal ectasias performed in an office-based setting: a retrospective cohort study

BackgroundThis study aimed to compare the complication rates of epithelium-off corneal cross-linking (epi-off CXL) performed in an office-based setting with those of epi-off CXL performed in an operating room.MethodsA retrospective cohort study, comprising 501 consecutive epi-off CXL procedures, performed in a non-sterile procedure room without laminar flow ventilation at the ELZA Institute in Zurich, Switzerland, between November 2015 and October 2021, was conducted.ResultsNo cases of postoperative infectious keratitis were observed, while sterile infiltrates occurred in 10 out of 501 (2.00%) patients, all of whom responded well to topical steroid therapy. Delayed epithelialization (> 7 days) occurred in 14 out of 501 (2.79%) patients. No other adverse events were noted.ConclusionsOffice-based epi-off CXL does not appear to be associated with an increased risk of complications when compared to operating room settings.

A 7-year review of clinical characteristics, predisposing factors and outcomes of post-keratoplasty infectious keratitis: the Nottingham infectious keratitis study.

Post-keratoplasty infectious keratitis (PKIK) is a unique sight-threatening clinical entity which often poses significant therapeutic challenges. This study aimed to examine the clinical presentation, risk factors, management, and clinical outcomes of PKIK. This was a retrospective study of all patients who presented to the Queen's Medical Centre, Nottingham, with PKIK between September 2015 and August 2022 (a 7-year period). Relevant data on types of keratoplasty, clinical presentations, causative microorganisms, management, and outcome were analyzed. Forty-nine PKIK cases, including four cases of interface infectious keratitis, were identified during the study period. The most common graft indications for PKP, DALK and EK were failed grafts (9, 37.5%), keratoconus (6, 54.5%) and Fuchs endothelial corneal dystrophy (FECD; 8, 57.1%), respectively. Staphylococcus spp. were the most commonly identified organisms (15, 50.0%). Bullous keratopathy (18, 36.7%), ocular surface disease (18, 36.7%), and broken/loose sutures (15, 30.6%) were the most common risk factors. Concurrent use of topical steroids was identified in 25 (51.0%) cases. Of 31 functioning grafts at presentation, 12 (38.7%) grafts failed at final follow-up with 15 (48.4%) patients retaining a CDVA of ≥1.0 logMAR. The overall estimated 5-year survival rate post-PKIK was 55.9% (95% CI, 35.9%-75.9%), with DALK having the highest survival rate [63.6% (95% CI, 28.9%-98.3%)], followed by EK [57.1% (95% CI, 20.4%-93.8%)] and PKP [52.7% (95% CI, 25.1%-80.3%)], though no statistical difference was observed (p=0.48). PKIK represents an important cause of IK and graft failure. Bullous keratopathy, OSD and suture-related complications are the commonest risk factors, highlighting the potential benefit of prophylactic topical antibiotics (for unhealthy ocular surface) and early suture removal (where possible) in reducing the risk of PKIK. Graft survival may be higher in lamellar keratoplasty following PKIK but larger studies are required to elucidate this observation.

Clinical Characterization and Outcomes of Culture- and Polymerase Chain Reaction-Negative Cases of Infectious Keratitis.

To examine the clinical presentation, management, and outcomes of culture and polymerase chain reaction (PCR) negative cases of infectious keratitis. In this retrospective case series, we evaluated the laboratory and medical records of culture- and PCR-negative cases (2016-2020) reported to a tertiary care center, which were presumed to be infectious keratitis on the basis of clinical history and presentation. A total of 121 cases with culture-negative keratitis were included in this study. The mean age of the patients was 48.42 ± 1.89 years, and 53.72% were female. At presentation, the presumed etiology was viral in 38.01%, bacterial in 27.27%, fungal in 8.26%, Acanthamoeba in 6.61%, and unlisted in 28.92% of cases. The most common risk factors were a previous history of ocular surface diseases (96.69%) and contact lens use (37.19%). In total, 61.98% of the patients were already on antimicrobial medication at presentation. The initial management was altered in 79 cases (65.29%) during the treatment course. Average presenting and final (post-treatment) visual acuities (VA) were 0.98 ± 0.04 (LogMAR) and 0.42 ± 0.03 (LogMAR), respectively. A significantly higher frequency of patients with a final VA worse than 20/40 (Snellen) had worse VA at initial presentation (p < 0.0001). A history of ocular surface disease, cold sores, and recurrent infection (p < 0.05) were more commonly associated with a presumed diagnosis of viral keratitis. The patients with presumed bacterial etiology were younger and had a history of poor contact lens hygiene (p < 0.05). We observed a distinct difference in clinical features among patients with culture-negative and PCR-negative keratitis managed for presumed viral and bacterial infections. Although there was significant variability in presentation and management duration in this cohort, the visual outcomes were generally favorable.

Validation of the C-DU(KE) Calculator as a Predictor of Outcomes in Patients Enrolled in Steroids for Corneal Ulcer and Mycotic Ulcer Treatment Trials.

The aim of this study was to validate the C-DU(KE) calculator as a predictor of treatment outcomes on a data set derived from patients with culture-positive ulcers. C-DU(KE) criteria were compiled from a data set consisting of 1063 cases of infectious keratitis from the Steroids for Corneal Ulcer Trial (SCUT) and Mycotic Ulcer Treatment Trial (MUTT) studies. These criteria include corticosteroid use after symptoms, visual acuity, ulcer area, fungal etiology, and elapsed time to organism-sensitive therapy. Univariate analysis was performed followed by multivariable logistic regressions on culture-exclusive and culture-inclusive models to assess for associations between the variables and outcome. The predictive probability of treatment failure, defined as the need for surgical intervention, was calculated for each study participant. Discrimination was assessed using the area under the curve for each model. Overall, 17.9% of SCUT/MUTT participants required surgical intervention. Univariate analysis showed that decreased visual acuity, larger ulcer area, and fungal etiology had a significant association with failed medical management. The other 2 criteria did not. In the culture-exclusive model, 2 of 3 criteria, decreased vision [odds ratio (OR) = 3.13, P < 0.001] and increased ulcer area (OR = 1.03, P < 0.001), affected outcomes. In the culture-inclusive model, 3 of 5 criteria, decreased vision (OR = 4.9, P < 0.001), ulcer area (OR = 1.02, P < 0.001), and fungal etiology (OR = 9.8, P < 0.001), affected results. The area under the curves were 0.784 for the culture-exclusive model and 0.846 for the culture-inclusive model which were comparable to the original study. The C-DU(KE) calculator is generalizable to a study population from large international studies primarily taking place in India. These results support its use as a risk stratification tool assisting ophthalmologists in patient management.

Microbiological Profile of Infectious Keratitis at a Tertiary Care Hospital

In developing countries, infectious keratitis being the probable cause of preventable blindness, also have a varied epidemiological profile. This study was conducted to know the microbiological profile, risk factors, epidemiology and antimicrobial susceptibility pattern of bacteria isolated from patients with a corneal ulcers. A total of 193 patients who were clinically diagnosed with cases of infective keratitis in the Department of Ophthalmology were included in the study. The sample collected by an ophthalmologist was received in the Microbiology department. All the demographic details and relevant clinical data were noted. The bacterial identification and antimicrobial susceptibility were done using automated methods while the fungal identification was done using the conventional method (Vitek2 Compact system, BioMerieux). Out of 193 patients, 69% were male and 31% % were females. The Majority of cases were from the age group 41- 50 years. Of 193 cases, 83 (43%) showed microbial etiology in culture. Of 83 culture positive cases, 55 (66.3%) were fungal and 28 (33.7%) were bacterial. The most common isolated fungus was Fusarium species detected in 24 (28.9%) cases followed by Aspergillus species in 14 (16.8%) cases. Gram positive bacteria were predominantly isolated from cases of infective keratitis. Staphylococcus aureus was the most common isolated bacteria in 12 (14.4%) out of 83 positive cases followed by Coagulase negative Staphylococcus. Pseudomonas aeruginosa was the most common Gram negative bacteria isolated from the cases. Among the topical antimicrobials, both Gram positive bacteria as well as Gram negative bacteria showed maximum sensitivity to levofloxacin. Proper knowledge of the clinical presentation and etiological agents aided with microbiological examination is necessary in order to effectively treat corneal ulcers and prevent further complications that can lead to blindness.

Infectious keratitis: an update on the prevalence, risk factors, culture results, clinical features, visual outcomes, and therapeutic strategies of infectious keratitis.

This study aimed to assess the prevalence, risk factors, culture results, clinical features, visual outcomes, and therapeutic strategies of infectious keratitis after surface ablation (PRK). This single-center prospective case-series review comprised 6500 eyes of 3400 patients undergoing PRK operation successively at the Ardabil Noor Surgical Center between January 1, 2003, and February 1, 2020. The incidence, risk factors, and clinical course were recorded for these samples. Three clinical and culture-proven cases of infectious keratitis in three eyes of three patients were diagnosed during the study period. Post-operative keratitis was observed in cases 1 and 2 after 3 days and in case 3 after 112 days. The results of cultures were positive in all three cases. The isolated microorganisms were Staphylococcus species in cases 1 and 2 and Candida Albicans in case 3. The final corrected distance visual acuity was 20/25 and 20/20 in cases 1 and 2, respectively, and hand motion in case 3. All three patients had some risk factors such as well-controlled familial Mediterranean fever, mild Meibomian gland dysfunction, and the healthcare environment of the patient's wife in case 1, contact lens manipulation in case 2, and dry eye in case 3. The prevalence of infectious keratitis after PRK was 0.046%. Infectious keratitis is one of the complications of PRK that can threaten patients' vision. Accordingly, proper preoperative clinical history taking, adequate eye exam and aggressive management can help maintain good eyesight in patients who undergo PRK surgery.

Evaluation of a Post-Operative Therapy Protocol after Epithelium-Off Corneal Cross-Linking in Patients Affected by Keratoconus

A large retrospective study evaluated the safety of a post-operative therapy protocol after epithelium-off corneal collagen cross-linking (CXL). In total, 1703 eyes of the 1190 patients with progressive keratoconus were enrolled in a retrospective cohort study in a tertiary care university hospital. CXL was performed using a standardized technique (Dresden protocol: 0.1% riboflavin solution containing dextran 20% for 30 min during the soaking phase followed by 30-min ultraviolet A irradiation (3 mW/cm2)). Postoperatively, a bandage contact lens was applied, and therapy included a topical fluoroquinolone antibiotic until the epithelium healed, followed by topical fluorometholone treatment for three weeks. Post-operative complications were recorded and analyzed. No cases of infectious keratitis occurred, whereas peripheral sterile infiltrates were observed in 1.17% of cases. Trace haze was typically present but did not have an impact on visual acuity. In fifteen cases (0.88%), visually significant anterior stromal opacity developed. Mild signs of dry eye were observed in 22 eyes (1.29%). The present study demonstrates that a post-operative treatment protocol including fluoroquinolone antibiotics and a BCL in the first phase until complete epithelial healing, followed by a three-week period of topical steroid treatment is safe and not associated with the development of microbial keratitis.