Immunization rates for US children aged 19 to 35 months reached their
highest levels ever in 2003, but factors such as parental perceptions continue
to limit coverage.
The Centers for Disease Control and Prevention's (CDC) National Immunization
Survey found that 2003 coverage for the standard immunization series for young
children increased to about 79%, up from nearly 75% in 2002 and 74% in 2001.
The recommended 4:3:1:3:3 series includes 4 doses of diphtheria, tetanus,
and pertussis (DPT) vaccine, 3 doses of polio vaccine, 1 dose of measles-containing
vaccine (MCV), 3 doses of Haemophilus influenzae type
b (Hib) vaccine, and 3 doses of hepatitis B (HepB) vaccine, generally administered
between birth and 18 months (MMWR Morb Mortal Wkly Rep.
Mitka M. Improvement Seen in US Immunization Rates. JAMA. 2004;292(10):1167. doi:10.1001/jama.292.10.1167