| http://www.w3.org/ns/prov#value | - Provided by the U.S. Centers for Disease Control and Prevention (CDC) A modified varicella, known as breakthrough disease, can occur in some vaccinated persons, because the vaccine is 70%???90% effective in preventing. ??? ???Chapter 2 - Varicella (Chickenpox) - 2010 Yellow Book | CDC???, wwwn.cdc.govChickenpox or chicken pox is a highly contagious illness caused by primary infection with varicell
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