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Nearly half of U.S. children late receiving vaccines

(Reuters) - Nearly half of babies and toddlers in the United States aren't getting recommended vaccines on time, according to a study - and if enough skip vaccines, whole schools or communities could be vulnerable to diseases such as whooping cough and measles.

"What we're worried about is if (undervaccination) becomes more and more common, is it possible this places children at an increased risk of vaccine-preventable diseases?" said study leader Jason Glanz, with Kaiser Permanente Colorado in Denver.

"It's possible that some of these diseases that we worked so hard to eliminate (could) come back."

Glanz and his colleagues analyzed data from eight managed care organizations, including immunization records for about 323,000 children.

During the study period, the number of children who were late on at least one vaccine - including their measles, mumps and rubella (MMR) and diphtheria, tetanus and pertussis (DTaP) shots - rose from 42 percent to more than 54 percent.

Babies born towards the end of the study were late on their vaccines for more days, on average, than those born earlier.

"When that happens, it can create this critical mass of susceptible individuals," said Saad Omer, from the Emory Vaccine Center in Atlanta, who wasn't involved in the new study.

Just over one in eight children went undervaccinated due to parents' choices. For the rest, it wasn't clear why they were late getting their shots. Some could have bounced in and out of insurance coverage, Glanz suggested, or were sick during their well-child visits, so doctors postponed vaccines.

Undervaccinated kids also tended to have fewer doctors' appointments and emergency room visits than those who got their shots on time, according to findings published in the journal JAMA Pediatrics.

That could be because their parents more often turn to alternative or complementary medicine when it's an option, Omer said.

Recent studies have shown many parents asking to delay or skip certain vaccines, often citing safety concerns such as a link between vaccines and autism - a theory which scientists now agree holds no water.

"We don't really know if these 'alternative schedules' as they're called are as safe, less safe or more safe than the current schedule, Glanz told Reuters Health, adding that parents who are considering an alternative vaccination schedule should talk with their child's doctor first - and be especially careful about what they read online.

"We don't have any evidence that there are any safety concerns with the current recommended schedule, and right now the best way to protect your child from infection is to get your child vaccinated on time," he said. SOURCE: http://bit.ly/P7ryPx

(Reporting from New York by Genevra Pittman at Reuters Health; editing by Elaine Lies)

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