From the Centers for Disease Control and Prevention. Vaccination coverage of 2-year-old children--United States, January-March, 1994.
D002675:Child, Preschool; D003140:Communicable Disease Control; D006801:Humans; D017589:Immunization Programs; D007223:Infant; D014481:United States; D014611:Vaccination / Q000706:statistics & numerical data*