Herpes simplex keratitis:A brief clinical overview

The aim of our minireview is to provide a brief overview of the diagnosis,clinical aspects,treatment options,management,and current literature available regarding herpes simplex keratitis(HSK).This type of corneal viral infection is caused by the herpes simplex virus(HSV),which can affect several tissues,including the cornea.One significant aspect of HSK is its potential to cause recurrent episodes of inflammation and damage to the cornea.After the initial infection,the HSV can establish a latent infection in the trigeminal ganglion,a nerve cluster near the eye.The virus may remain dormant for extended periods.Periodic reactivation of the virus can occur,leading to recurrent episodes of HSK.Factors triggering reactivation include stress,illness,immunosuppression,or trauma.Recurrent episodes can manifest in different clinical patterns,ranging from mild epithelial involvement to more severe stromal or endothelial disease.The severity and frequency of recurrences vary among individuals.Severe cases of HSK,especially those involving the stroma and leading to scarring,can result in vision impairment or even blindness in extreme cases.The cornea's clarity is crucial for good vision,and scarring can compromise this,potentially leading to visual impairment.The management of HSK involves not only treating acute episodes but also implementing long-term strategies to prevent recurrences and attempt repairs of corneal nerve endings via neurotization.Antiviral medications,such as oral Acyclovir or topical Ganciclovir,may be prescribed for prophylaxis.The immune response to the virus can contribute to corneal damage.Inflammation,caused by the body's attempt to control the infection,may inadvertently harm the corneal tissues.Clinicians should be informed about triggers and advised on measures to minimize the risk of reactivation.In summary,the recurrent nature of HSK underscores the importance of both acute and long-term management strategies to preserve corneal health and maintain optimal visual function.

Effects of integrated traditional Chinese and western medicine on the vision recovery and serum trace elements of patients with herpes simplex keratitis

Objective:To explore the effects of integrated traditional Chinese and western Medicine on the vision recovery and serum trace elements in patients with herpes simplex keratitis.Methods:A total of 86 cases of HSK patients admitted in Baogang Hospital of Inner Mongolia from January 2015 to October 2016 were selected and divided randomly into the observation group(n=43)and the control group(n=43)according to the random number table.The control group was treated with ganciclovir eye drops and chondroitin sulfate eye drops,and the observation group was treated with Qinggan Mingmu Decoction on the basis of the control group.The 2 groups were treated for 4 weeks continuously.The clinical efficacy was compared between two groups.The vision recovery,serum trace elements and tear immune factor levels were also compared between two groups before and after treatment.Results:After treatment,the effective rate of treatment in the observation group was significantly higher than that in the control group(p<0.05);in the observation group of patients,visual analogue scale(VAS)score and visual acuity after treatment were obviously higher than those before treatment,and also remarkably higher than those in the control group of patients(p<0.05);after treatment,the levels of Fe,Ca and Cu ions in the observation group were significantly lower than those in the control group and before treatment(p<0.05);after treatment,the level of zinc ions in the serum in the observation group was significantly higher than that before treatment and in the control group(p<0.05);after treatment,the levels of tear IgA,IgG and C3 in the observation group were prominently higher than those before treatment and in the control group(p<0.05).Conclusions:In the treatment of HSK,integrated traditional Chinese and western medicine can promote effectively the vision recovery,regulate the level of trace elements in the serum and enhance the level of tear immune factors,with the clinical efficacy better than the treatment of western medicine alone.

Virus DNA Detection of Herpes Simplex Keratitis by PCR

HSV-DNA of seven corneal lesions suspected with herpessimplex keratitis (HSK) and nine normal human donor corneas weredetected by PCR,Five out of seven diseased corneas showed positiveresults,and the other two diseased corneas and nine.normal corneasnegative.The results suggest the PCR may be useful as a rapid andsensitive method for diagnosing HSK.Eye Science 1993;9:126-128.

DNA vaccine expressing herpes simplex virus 1 glycoprotein C and D protects mice against herpes simplex keratitis

AIM： To investigate whether DNA vaccine encoding herpes simplex virus 1（HSV-1） glycoprotein C（g C） and glycoprotein D（g D） will achieve better protective effect against herpes simplex keratitis（HSK） than DNA vaccine encoding gD alone. METHODS： DNA vaccine expressing gD or gC combined g D（g D.g C） were constructed and carried by chitosan nanoparticle. The expression of fusion protein gD and gC were detected in DNA/nanoparticle transfected 293 T cells by Western-blot. For immunization, mice were inoculated with DNA/nanoparticle for 3 times with 2 wk interval, and two weeks after the final immunization, the specific immune responses and clinical degrees of primary HSK were evaluated. RESULTS： Fusion protein g D.g C could be expressed successfully in cultured 293 T cells. And, p RSC-g C.g DIL21 DNA/chitosan nanoparticle could effectively elicit strongest humoral and cellular immune response in primary HSK mice evidenced by higher levels of specific neutralizing antibody and s Ig A production, enhanced cytotoxicities of splenocytes and nature killer cells（NK）,when compared with those of gD alone or mocked vaccine immunized mice. As a result, gC-based vaccine immunized mice showed least HSK disease. CONCLUSION： gC-based DNA vaccine could effectively prevent the progress of primary HSK, suggesting that this DNA vaccine could be a promising vaccine for HSK treatment in the future.

Clinical Efficacy of Oral Ganciclovir for Prophylaxis and Treatment of Recurrent Herpes Simplex Keratitis

Background：Herpes simplex keratitis （HSK） caused by herpes simplex virus 1 （HSV-1）,which has high recurrent rate and incidence of severe vision loss,is the leading cause of infectious blindness in the world.The aim was to explore the clinical efficacy of oral ganciclovir （GCV） in the prevention of recurrent HSK.Methods：A multicenter,prospective,randomized,single-blind,and controlled clinical trial was conducted from April 2010 to June 2013.One hundred seventy-three patients （173 eyes involved） who were diagnosed as recurrent HSK definitely,including stromal keratitis and corneal endotheliitis,were divided into three groups randomly：negative control （placebo） group was topically administered with 0.15% GCV ophthalmic gel,4 times per day and 0.1% fluorometholone eye drops,3 times per day until resolution of HSK; positive control acyclovir （ACV） group was topically adopted the same ophthalmic gel and eye drops and additionally received oral ACV 400 mg 5 times a day for 10 weeks and followed by 400 mg 2 times per day for 6 months; test GCV group was topically adopted the same treatment as negative control group and additionally received oral GCV 1000 mg 3 times per day for 8 weeks.The symptoms and signs were evaluated before and after the therapy 1^st week,2^nd week and then followed up every 2 weeks until recovery.Furthermore,we followed up recurrence of HSK for every 3 months after recovery and then assessed the cure time,recurrent rate and adverse reactions.Results：One hundred and seventy-three patients were followed up 7-48 months （mean 32.1 ± 12.3 months）,but 34 patients were failed to follow-up.The cure time was 12.1± 4.3,11.9 ± 4.0 weeks in negative control （placebo） group and positive control ACV group respectively （P =0.991）,which was longer than that in test GCV group （8.6 ± 2.8 weeks） and there was a significant difference between test GCV group and negative control （placebo） group or positive control ACV group （P =0.000）.Furthermore,the recurrent rate was higher in negative control （placebo） group （47.3%） than that in positive control group ACV （26.7%） and test GCV group （17.2%）,and there was a great significant difference among the three groups （P =0.007）,but there was no significant difference between positive control ACV group and test GCV group （P =0.358）.In addition,there was no obvious adverse reaction expect neutropenia （only one patient in test GCV group）.Conclusion：Short-term oral GCV could cure recurrent HSK and endotheliitis,shorten the course,reduce recurrent rate of HSK and have confirmed safety.

Infectious keratitis in Vietnam:etiology,organisms,and management at Vietnam National Eye Hospital

AIM:To report the etiologies,risk factors,treatments,and outcomes of infectious keratitis(IK)at a major Vietnamese eye hospital.METHODS:This is a retrospective review of all cases of IK at Vietnam National Eye Hospital(VNEH)in Hanoi,Vietnam.Medical histories,demographics,clinical features,microbiological results,and treatment outcomes were reviewed.RESULTS:IK was diagnosed in 1974 eyes of 1952 patients,with ocular trauma being the greatest risk factor for IK(34.2%),frequently resulting from an agriculturerelated injur y(53.3%).The mean duration between symptom onset and presentation to VNEH was 19.3±14.4 d,and 98.7%of patients had been treated with topical antibiotic and/or antifungal agents prior to evaluation at VNEH.Based on smear results of 1706 samples,the most common organisms identified were bacteria(n=1107,64.9%)and fungi(n=1092,64.0%),with identification of both bacteria and fungi in 614(36.0%)eyes.Fifty-five of 374 bacterial cultures(14.7%)and 426 of 838 fungal cultures(50.8%)were positive,with the most commonly cultured pathogens being Pseudomonas aeruginosa,Streptococcus pneumonia,Fusarium spp.,and Aspergillus spp.Corneal perforation and descemetocele developed in 391(19.8%)and 93(4.7%)eyes,respectively.Medical treatment was successful in resolving IK in 50.4%eyes,while 337(17.1%)eyes underwent penetrating or anterior lamellar keratoplasty.Evisceration was performed in 7.1%of eyes,most commonly in the setting of fungal keratitis.CONCLUSION:Ocular trauma is a major risk factor for IK in Vietnam,which is diagnosed in almost 400 patients each year at VNEH.Given this,and as approximately one quarter of the eyes that develop IK require corneal transplantation or evisceration,greater emphasis should be placed on the development of prevention and treatment programs for IK in Vietnam.

Clinical correlates of common corneal neovascular diseases: a literature review

A large subset of corneal pathologies involves the formation of new vessels(neovascularization), leading to compromised visual acuity. This article aims to review the clinical causes and presentations of corneal neovascularization(CNV) by examining the mechanisms behind common CNV-related corneal pathologies, with a particular focus on herpes simplex stromal keratitis,contact lenses-induced keratitis and CNV secondary to keratoplasty. Moreover, we reviewed CNV in the context of different types of corneal transplantation and keratoprosthesis, and summarized the most relevant treatment available so far.

Host immune cellular reactions in corneal neovascularization

Corneal neovascularization（CNV） is a global important cause of visual impairment. The immune mechanisms leading to corneal heme- and lymphangiogenesis have been extensively studied over the past years as more attempts were made to develop better prophylactic and therapeutic measures. This article aims to discuss immune cells of particular relevance to CNV, with a focus on macrophages, Th17 cells, dendritic cells and the underlying immunology of common pathologies involving neovascularization of the cornea. Hopefully, a thorough understanding of these topics would propel the efforts to halt the detrimental effects of CNV.