The highest hepatitis A vaccination coverage levels among children aged 24-35 months and the greatest decline in acute hepatitis A infections occurred in states, counties and communities where hepatitis A vaccination has been routinely recommended since 1999.
Hepatitis A vaccine was licensed for use in children =24 months of age in 1995. Since 1999, the vaccine has been routinely recommended for children living in states, counties and communities where the rate of hepatitis A virus (HAV) infections was twice the 1987-1997 national average.
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