June 2, 2011 -- More than 90% of children entering kindergarten in the U.S. have had most recommended immunizations, although coverage rates remain below target goals for most states, the CDC says.
The newly published vaccination coverage report for the first time includes state-by-state data on vaccination exceptions granted for medical, religious, or philosophical reasons.
More than half of the states providing vaccination information to the CDC had exemption rates of around 1% or less. Four states -- Alaska, Washington, Oregon, and Vermont -- had exemptions above 5%.
"Nationwide, the number of children who have not been vaccinated at all is less than 1%," CDC Director of Immunization Services Lance Rodewald, MD, tells WebMD. "This shows that parents and physicians understand that vaccination is the bedrock of child health efforts."
Forty-seven states and the District of Columbia provided data for the vaccine coverage report, published in the June 3 issue of the CDC's Morbidity and Mortality Weekly Report.
The government's target goals for vaccination among children entering kindergarten is 95% or greater coverage by 2020 for poliovirus; diphtheria, tetanus, and pertussis (DTP/DTaP/DT); measles, mumps, and rubella (MMR); hepatitis B; and varicella, the vaccine that prevents chickenpox.
The report revealed that:
Seventeen states reported coverage of 95% or more for each of four major vaccines: poliovirus; diphtheria, tetanus, and pertussis; measles, mumps, and rubella; and hepatitis B.
Just four states -- Georgia, Mississippi, Texas, and South Dakota -- had 95% or higher coverage for two doses of varicella vaccine. School-based chickenpox outbreaks led to a recommendation for a second varicella dose in 2006, but it appears that many children aren't getting the booster.
Mississippi reported less than 1% medical or non-medical exemptions, while Washington State had the highest percentage of exemptions, with 6.2% of children entering kindergarten with parent-signed exemption forms for one or more vaccines.
Philosophical Objections to Vaccines
The vast majority of the exemptions in Washington (4,515 of 5,015) resulted from parents who have philosophical objections to having their children vaccinated.
But Michele Roberts of the Washington State Department of Health says the number may be misleading because the state now allows parents to sign vaccination exemption forms when they register their children for school, so parents without the right documentation may be signing the forms for convenience.