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Edward W. Boyer, Michael Shannon, Patricia L. Hibberd · New England Journal of Medicine · 2001
pox subsequently developed in a close contact of their children, whereas 30 percent of parents of 195 children whose PCR test was positive reported that chickenpox had developed in a close contact.Both of these findings support our contention that the children who did not have a positive PCR test were not infected with varicella-zoster virus.