We have to take into the account that it is identified in common for both data that the age peak in the incidence rate has shifted from 4 or 5 to 6 years old, although the incidence rate of varicella with the National Health Insurance Service (NHIS) data decreased contrary to an increasing trend with the National Notifiable Disease Surveillance System (NNDSS) data.
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Letter to the Editor: Epidemiological Comments on the Effectiveness of the Varicella Vaccine in Korea.
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