Children and families are the hardest hit by the vaccine shortage, but they also face significant challenges.
The Centers for Disease Control and Prevention reported that children under the age of six are more likely to die from vaccines than adults, with children younger than 12 having an increased risk of contracting respiratory infections and respiratory distress syndrome.
According to a recent survey, parents are more than twice as likely as schoolteachers to give their children a booster shot.
But there are other challenges to getting kids vaccinated.
When vaccines are not administered to children, they are often given to adults, according to a 2016 study in Pediatrics.
One reason children are more vulnerable to getting sick with a vaccine-preventable illness is that they may be exposed to more vaccines than the general population.
A recent study from the Centers for Diseases Control and HIV/AIDS found that between 2011 and 2016, more than 1.2 million children under 18 received a vaccine shot and that about a quarter of those children were immunocompromised.
Many parents believe the vaccines can help kids avoid getting sick, but research suggests that many kids will still get sick from getting a booster dose.
A recent report in Pediatrics examined how many children in the United States received a shot in 2016 and found that about 50 percent of children in their states had received a booster for a respiratory infection.