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Graefe's Archive for Clinical and Experimental Ophthalmology

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01-07-2021 | Herpes Simplex Type 1 | Cornea

Comparative profile of ocular surface microbiome in vernal keratoconjunctivitis patients and healthy subjects

Authors: Pratima Vishwakarma, Sanchita Mitra, Tushar Beuria, Manas Ranjan Barik, Srikant K. Sahu

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 7/2021

Abstract

Purpose

To compare ocular surface microbiome and its antibiotic sensitivity in vernal keratoconjunctivitis (VKC) with normal ocular surface.

Methods

In this case-control study, thirty patients each with clinical diagnosis of VKC and age-matched controls with normal ocular surface were enrolled. Tear film samples were collected from each group and subjected to microbial evaluation with microscopy, conventional culture methods, and polymerase chain reaction (PCR). Microbial diversity and antibiotic sensitivity patterns were analyzed.

Results

Most patients (67%) belonged to severe grades (3 and 4) of VKC, and allergic history could be elicited in 20%. On culture, bacteria were isolated in 50% of VKC patients and 47% of control group. Staphylococcus species were identified in 70% VKC group and 57% control group. S. aureus growth was seen in 52% and 21% of VKC patients and controls, respectively. S. pneumoniae was isolated only in controls (29%) (p<0.05). Confluent colonies (≥10 colonies/μl) were seen in 70% of VKC patients and 14% of controls (p<0.05). Fluoroquinolone resistance was more among higher grades of VKC (50%) (p<0.01) and was observed in 46% of VKC patients and 23% of control group (p<0.01). Both groups were negative for HSV-1 DNA and fungal growth.

Conclusion

Staphylococcus, the most common ocular surface flora, was predominant in VKC patients. Microbial analysis revealed similar microbial diversity in both groups. However, bacterial load was higher in VKC. Increased fluoroquinolone resistance was observed in VKC patients with more resistance among higher grades. Fungi and HSV-1 were not seen in VKC or normal ocular surface.

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Title: Comparative profile of ocular surface microbiome in vernal keratoconjunctivitis patients and healthy subjects
Authors: Pratima Vishwakarma
Sanchita Mitra
Tushar Beuria
Manas Ranjan Barik
Srikant K. Sahu
Publication date: 01-07-2021
Publisher: Springer Berlin Heidelberg
Keywords: Herpes Simplex Type 1
Antibiotic
Polymerase Chain Reaction
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 7/2021
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-021-05109-z

At a glance: The STEP trials

Springer Medicine

Comparative profile of ocular surface microbiome in vernal keratoconjunctivitis patients and healthy subjects

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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