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1 in 6 toddlers have not completed childhood vaccine series, study finds - ABC News

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Several routine childhood vaccines require multiple doses to be effective, but a new study finds children are not receiving all of them.

The study, published in the journal Pediatrics Wednesday, found one in six toddlers between ages 19 months and 35 months started the vaccine series but didn't complete it, leaving them vulnerable to serious diseases.

Researchers from several institutions, including the University of Montana, the University of Colorado, Kaiser Permanente Colorado and the Yale School of Public Health, looked at data from the 2019 National Immunization Survey for more than 16,000 children.

They looked at vaccine series' that protects children from 11 different diseases including diphtheria, tetanus, acellular pertussis, pneumococcal infections, Haemophilus influenzae type B, hepatitis B, polio, measles, mumps, rubella and varicella.

The study found that only 72.9% of toddlers completed the combined 7-vaccine series and 17.2% -- equivalent to one in every six toddlers -- initiated, but did not complete, the one or multiple multi-dose vaccine series.

PHOTO: In this undated stock photo, a gloved doctor applies a bandage to a young patient after an injection.

In this undated stock photo, a gloved doctor applies a bandage to a young patient after an injection.

STOCK PHOTO/Getty Images

What's more, approximately 1.1% of children were completely unvaccinated and 9.9% had not initiated one or more of the seven vaccinations.

Overall we found that 8.5% of U.S. kids were one dose away from completing the combined 7-vaccine series, which is one of our standard metrics of measuring vaccination coverage," Sara Michels, lead author and epidemiologist at the University of Montana Center for Population Health Research, told ABC News. "If children who were missing only one outstanding dose had received that dose, the U.S. could have met some of our key national vaccination coverage goals."

Researchers say this is evidence of a trend that has been occurring for years.

"I think the study highlighted a trend that we had been seeing in pediatrics prior to the pandemic," Dr. Nathaniel Beers, executive vice president of community and population health at Children's National Hospital in Washington, D.C., who was not involved in the study, told ABC News.

"I think certainly during the pandemic, we've seen actually worsening of this trend and have been doing a lot of work in the last year in particular to across the field of pediatrics to ensure that we were addressing the worsening vaccination rates beyond the those that were highlighted in the study that was published," he added.

Ninety-three percent of kindergarten-age children had received the recommended vaccines, according to a recent report from the Centers for Disease Control and Prevention conducted during the 2021–22 school year.

This is lower than both the 94% coverage reported during the 2020–21 school year, and the 95% coverage reported during the 2019–20 school year, prior to the pandemic.

Researchers identified factors for why some children started, but did not complete, the vaccine series including families moving across state lines, number of children in household and lack of health insurance.

"A lot of the recent research and recent population-based studies on vaccination coverage has focused on parental hesitancy, but this study and these findings suggest that logistical and structural barriers to vaccinations persist, and are a larger contributor to low vaccination coverage," Michels said. "Logistical barriers meaning, irregular fragmented childcare, lack of reminders prompting parents and caregivers to bring their child in for their booster doses, other pragmatic challenges to scheduling appointments or accessing immunization providers."

"Certainly, maintaining and sharing adequately of medical records creates barriers to ensuring adequate care," when people move across state lines, Beers added.

He continued, "We know people have been more transient for work or other reasons, and that certainly creates gaps in care for kids, particularly young kids who have frequent immunization needs in the first three years of life."

Beers said vaccine hesitancy, which is defined as delaying or refusing vaccination despite their widespread availability, is a contributing factor.

In 2019, the World Health Organization called vaccine hesitancy one of the top 10 threats to public health because it "threatens to reverse progress made in tackling vaccine-preventable diseases."

PHOTO: In this undated stock photo, a young patient receives a vaccine injection from a doctor.

In this undated stock photo, a young patient receives a vaccine injection from a doctor.

STOCK PHOTO/Getty Images

We've seen vaccine hesitancy play a role in measles outbreaks in the U.S. including a recent outbreak in Columbus, Ohio, where 85 children were infected.

"There's two components that are why we encourage people to get vaccinated," Beers said. "So, it's preventing the disease in yourself, but also preventing the spread of disease in the community."

This helps create herd immunity, in which enough people have been vaccinated or are immune to disease, which then becomes unable to spread.

To help increase rates, the team re-highlighted some methods including more widespread adoption of systems that remind parents their child is due for or is late receiving their next vaccine dose, expanding vaccines to more places outside of a primary care setting, as well as speaking to hesitant parents.

"We certainly [need to] continue to work on vaccine education, making sure that we are providing that for patients and families," Beers said. "Even for those families who have previously rejected the opportunity to get vaccines, making sure that we continue to offer them the opportunity to start those, and to continue that dialogue, because people do change their minds and continue to get good high-quality information is an important piece of helping people make a decision to move forward with vaccinations."

Michels said she hopes providers use the findings to implement vaccine interventions at the clinic level.

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