| − | '''Varicella''', also known as chickenpox, "is an acute [[contagious]] disease characterized by papular and vesicular lesions."<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#v</ref> | + | According to the US Centers for Disease Control and Prevention, '''Varicella''', also known as chickenpox, is "an acute [[contagious]] disease characterized by papular and vesicular lesions."<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#v</ref> |