Prevalence of HSV-1, HSV-2, and VZV infection ranges from 20-90%. Viral reactivation is common and results in a significant individual and socioeconomic burden. Pathognomonic skin manifestations are not always present, impairing definitive clinical diagnosis.

We evaluated the performance of a novel microarray-based multiplex PCR system (Euroarray, Euroimmun Medizinische Labordiagnostika) for the molecular detection of these pathogens. In this retrospective study, 50 consecutive specimens positive for HSV-1, HSV-2, or VZV (pre-characterized by qPCR) were analyzed. Two hundred-and-five negative test results were applied as a control group.

The microarray successfully detected the respective pathogens in all samples that yielded a qPCR quantifiable amount of DNA. Two and one specimens containing VZV and HSV-1 DNA beneath the limit of quantification tested microarray negative. Microarray specificity was 100%.

The microarray is a useful tool for diagnosing viral infections of skin and mucous membranes, allowing rapid differentiation between three pathogens in a single assay.