Skip Navigation LinksHome > January 2007 - Volume 26 - Issue 1 > Dendritic Keratitis Caused by an Acyclovir-Resistant Herpes...
doi: 10.1097/01.ico.0000240081.19635.db
Case Report

Dendritic Keratitis Caused by an Acyclovir-Resistant Herpes Simplex Virus With Frameshift Mutation

Zhang, Wei MD, PhD; Suzuki, Takashi MD, PhD; Shiraishi, Atsushi MD, PhD; Shimamura, Ichiroh MD; Inoue, Yoshitsugu MD, PhD; Ohashi, Yuichi MD, PhD

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Purpose: To report a case of acyclovir-resistant herpes simplex virus (HSV) keratitis after long-term, inconsistent use of topical acyclovir and fluorometholone.

Methods: A 70-year-old man with dendritic keratitis caused by an acyclovir-resistant HSV strain was examined. The 50% inhibitory concentration of different antiviral agents against the isolated virus and the DNA sequence of viral thymidine kinase were determined.

Results: The 50% inhibitory concentration of acyclovir and trifluorothymidine for the isolated HSV strain was 13.75 and 0.28 μg/mL, respectively, indicating that the virus was resistant to acyclovir. DNA sequencing of the viral thymidine kinase revealed that this virus had a frameshift mutant with a G insertion in the 7Gs homopolymer. Topical trifluorothymidine was effective, and the epithelial lesion was completely resolved within 2 weeks.

Conclusion: A typical form of dendritic keratitis was caused by an acyclovir-resistant HSV with frameshift mutation in a 7Gs homopolymer region.

Copyright © 2007 Wolters Kluwer Health, Inc. All rights reserved.


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