"The reason is that it hurts many people. It is not just your child."
Some young people cannot get vaccines, including those with cancer or immune diseases, and very young infants are vulnerable to pertussis, or whooping cough, until the age of two months when they can get begin to get doses of the vaccine.
Particularly with measles, one of the most contagious diseases, outbreaks will occur unless 94 percent or more of the population is vaccinated, according to Bloom.
Nationwide, vaccination rates among US kindergarteners have stayed high -- near 95 percent.
But a 2011 poll in the journal Pediatrics found that one in 10 parents did not stick to the recommended schedule of vaccines for their child, and a quarter of parents had doubts about vaccine safety.
The United States typically sees about 60 cases of measles per year.
"We don't have a crisis, but nonetheless the trend is going up and the number of immunizations is going down," said Bloom.
- Flu shots, cancer vaccines -
Another trend is resistance to vaccines like the annual flu shot, experts say.
The CDC said in February that two-thirds of adults aged 18 to 65 had not had their seasonal shot, and that hospitalizations in this age group had doubled over last year. Deaths from flu complications were also far higher than usual.
Doctors are also surprised at how many decline the three-dose shot to prevent HPV, a sexually transmitted infection which can lead to cervical cancer in women and cancers of the head, neck, penis and anus in men.
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