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A new method for detection of varicella-zoster virus (VZV) DNA using field-inversion gel electrophoresis (FIGE) was devised. VZV-genomic DNA could be differentiated from the host cell DNA of human embryonic lung (HEL) fibroblasts infected with VZV under electrophoretic conditions allowing resolution of linear and double-stranded DNAs in the 49-230 kilobase pairs (Kb) range. The detection of VZV-genomic DNA from infected HEL cells was successful regardless of whether the VZV was a laboratory strain, live vaccine strain, or fresh isolate. Under the same electrophoretic conditions, DNA of VZV-infected HEL cells could be clearly differentiated from DNA obtained from HEL cells infected with herpes simplex virus type 1 (HSV-1), type 2 (HSV-2), or human cytomegalovirus (HCMV). Furthermore, VZV genomic DNA could be detected from as small a sample as 1.9 x 10(4) VZV-infected HEL cells. Finally, we could detect VZV genomic DNA from 10 samples of vesicle tissue (blister lids, each about 1-4 mm2) and one sample of vesicle fluid (about 5 microliters) obtained from patients diagnosed as having herpes-zoster. The results of this study indicate that FIGE is a simple and promising method for the detection of VZV from clinical materials as well as infected in vitro cultured cells.
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