This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax firstname.lastname@example.org with numerous contributions by others.
Clinical trials, which span a decade and involved more than 11,000
persons in the United States, indicate that it is 70-90 percent
effective in preventing chickenpox. Studies also show that almost all
of the vaccinated patients who got chickenpox had a milder form of the