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Rapid strip assay for detection of anti-herpes simplex virus antibodies: application to prediction of varicella-zoster virus reactivation in patients with acute peripheral facial palsy.

Varicella-zoster virus (VZV) reactivation causes acute peripheral facial palsy in the majority (88%) of patients who lack anti-herpes simplex virus (HSV) antibodies, suggesting that an absence of anti-HSV antibodies is a reliable serological marker for the diagnosis of VZV reactivation in patients who are diagnosed initially as idiopathic peripheral facial palsy (Bell's palsy) [Furuta et al., 2000] Clinical Infectious Diseases]. A simple and rapid immunoassay for detection of anti-HSV antibodies based on HSV type 1 glycoprotein D was developed by modifying the conventional Western blot technique. The assay was evaluated by comparing the results with those of conventional Western blot. In total, 100 sera obtained from patients with acute peripheral facial palsy were tested and judged blindly by two investigators. Twenty-four of 26 HSV-seronegative sera were obtained from patients with VZV reactivation (Ramsay Hunt syndrome or zoster sine herpete). The sensitivity of the assay was over 95% and the specificity was 100%. The two investigators agreed on the diagnosis in 99 of the 100 sera. These results indicate that the rapid strip assay is applicable to prediction of VZV reactivation in patients diagnosed clinically with Bell's palsy before zoster lesions appear or PCR using saliva samples indicates VZV reactivation.