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. 1997 Nov;81(11):984–988. doi: 10.1136/bjo.81.11.984

Improved impression cytology techniques for the immunopathological diagnosis of superficial viral infections

M Thiel 1, W Bossart 1, W Bernauer 1
PMCID: PMC1722061  PMID: 9505824

Abstract

BACKGROUND—For epidemiological and therapeutic reasons early diagnosis of superficial viral infections is crucial. Conventional microbiological techniques are expensive, time consuming, and not sufficiently sensitive. In this study impression cytology techniques were evaluated to analyse their diagnostic potential in viral infections of the ocular surface.
METHOD—A Biopore membrane device instead of the original impression cytology technique was used to allow better quality and handling of the specimens. The impressions were processed, using monoclonal antibodies and immunoperoxidase or immunofluorescence techniques to assess the presence of herpes simplex virus, varicella zoster virus, or adenovirus antigens. Ocular surface specimens from healthy individuals (n=10) and from patients with suspected viral surface disease (n=19) were studied. Infected and non-infected cell cultures served as controls.
RESULTS—This modified technique of impression cytology allowed the collection of large conjunctival and corneal epithelial cell layers with excellent morphology. Immunocytological staining of these samples provided diagnostic results for all three viruses in patients with viral surface disease.
CONCLUSIONS—The use of Biopore membrane devices for the collection of ocular surface epithelia offers new diagnostic possibilities for external eye diseases. Immunopathological methods that are applied directly on these membrane devices can provide virological results within 1-4 hours. This contributes considerably to the clinical management of patients with infectious diseases of the ocular surface.



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Figure 1  .

Figure 1  

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The Biopore membrane device. (Top left) dry membrane (white); (top right) wet transparent membrane; (bottom left) device shown from the side with three small legs that are broken off before impression; (bottom right) this plastic rod is inserted into the device as a handle.

Figure 2  .

Figure 2  

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Typical appearance of a conjunctival impression harvested by the Biopore membrane. Large monolayers are seen without mechanical artefacts.

Figure 3  .

Figure 3  

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Dendritic corneal lesion. (A) and (B) before and after the impression. Note the well defined debridement of the herpetic lesion; (C) macroscopic aspect after immunohistological staining (PAP); (D) light microscopy reveals HSV antigen positive cells (red-brown) and negative cells (blue) (original magnification ×40).

Figure 4  .

Figure 4  

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Superficial herpetic keratitis. Impression of a dendritic corneal lesion after immunocytological staining (anti-HSV 1, PAP).

Figure 5  .

Figure 5  

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Conjunctival impression in adenoviral disease. Infected cells present with a brown-red PAP reaction after incubation with adenovirus antibody (original magnification ×40).

Figure 6  .

Figure 6  

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Dendritic lesion with varicella zoster virus. Immunofluorescence staining performed directly on the Biopore membrane shows positive cells with bright yellow fluorescence.

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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