Herpes Simplex Keratitis
Conditions
Keywords
Flocked swab, Traditional fiber swab, Herpes simplex epithelial keratitis, Quantitative PCR
Brief summary
The purpose of this study is to compare a corneal sampling realized by a flocked swab (flocked swab regular 519CS01) with a sampling by traditional fiber swab (Copan regular swab 164KS01 in polyester). Their impact on the sensibility of the viral culture in the Herpes simplex epithelial keratitis will be the primary objective of this study.
Detailed description
In our center, the flocked swabs became an important tool in the corneal sampling for viral keratitis, replacing rightly or wrongly the former traditional fibers swab. No research was specifically designed to study the corneal taking with these swabs. Nevertheless, numerous reasons would motivate it, because of the peculiarities in ophthalmology: the corneal sampling has to be made with the slit lamp rather than in a macroscopic manner; the corneal lesion are often millimetre-length and confined; the histology of the cornea is unique and compares only imperfectly with other structures of the human body like the nasal mucosa. In these circumstances, the properties of the stalk (rigidity, length) and of its extremity (roughness, textures, absorbance) can influence the quality of the sampling and the final result of the culture.
Interventions
PROCEDURECorneal sampling
Slit lamp corneal sampling with a Swab
Sponsors
CHU de Quebec-Universite Laval
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Slit lamp signs at the initial examination that are compatible with an Herpes simplex epithelial keratitis (Herpes simplex dendrite, herpes simplex geographic ulcer)
Exclusion criteria
* Topical or systemic antiviral Therapy during the last 14 days Patient with Herpes simplex stromal keratitis without epithelial involvement Herpetic lesion outside the cornea
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Result of the culture | 1 month after the initial visit | The result can be Positive or negative for Herpes simplex virus (HSV). Even if the result will be available in less than 1 week by the clinician after the culture, the research team will collect the data 1 month in average after the initial visit. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Time before positivity of the culture | 1 month after the initial visit | If the culture is positive for Herpes simplex virus, what is the time lapse(in day) before the culture became positive. The research team will collect the data 1 month in average after the initial visit by examining the microbiologic data of the laboratory. |
| Viral load concentration | 1 month after the initial visit | Quantitative polymerase chain reaction (PCR) will be on a part of the sampling 1 month after the initial visit. The result will be the concentration of virus in number/ml detected in the sampling |
Countries
Canada
Outcome results
None listed