We read with great interest the paper by Lee et al. 1 about the effects of one-dose varicella (chickenpox) vaccination on disease severity among pediatric varicella patients in Korea, given the recent concern about the effectiveness of the varicella vaccine in Korea. 2,3 Lee et al. 1 reported that vaccinated patients (breakthrough cases) had significantly less moderate-tosevere symptoms than non-vaccinated patients, which is consistent with the existing literature from other countries. 4,5 However, we think the paper by Lee et al. 1 can inadvertently mislead the reader into believing that varicella incidence in Korea has significantly increased even after the introduction of a national varicella immunization program in 2005 and the effectiveness of the varicella vaccine has been insufficient to prevent against varicella in Korea.
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