A nurse gives a young boy a vaccination.
After years of steady progress, the percentage of 2-year-olds in private health plans getting immunized dropped last year.
The findings come in a report released Wednesday by the National Committee on Quality Assurance, which keeps track of how well health insurers are doing at getting the right care for the people they cover.

Measles, mumps and rubella rates fell to 90.6 percent in 2009 from 93.5 percent in 2008. Diphtheria, tetanus and whooping cough fell to 85.4 percent last year from 87.2 percent in 2008. Chickenpox slipped to 90.6 percent in 2009 from 92 percent in 2008.
Insurers attribute the decline to parents’ fears that vaccinations could be linked to autism. Though public health experts and government studies have found no evidence that vaccinations cause autism, the subject has been subject of fierce debate on the Internet and outspoken celebrities have fueled the controversy.
"Vaccination paranoia is out there," said George Halvorson, CEO of Kaiser Permanente, of the nation??