Exactly 0 Babies Died From Chicken Pox From 2004-2007 (And It Wasn't Because They Were Vaccinated)

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Parents choose not to protect their children from illness through vaccination for many reasons, and almost none of them are good reasons. Nevertheless, one of the tried and (not) true defenses of this truly unwise decision is this: "Why do you care about whether my kid is vaccinated? It doesn't affect you."

We're officially done with that argument.

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Dr. Carroll: In the last few years, the rates of vaccine-preventable illnesses have been on the rise. This isn't just something that's happening in the United States. It's happening throughout the world. Often, these outbreaks begin with unvaccinated people. They spread through them too. Outbreaks occur because of a breakdown in herd immunity. That's the topic of this week's "Healthcare Triage."

Here in the United States, vaccines are often required in order for kids to attend school. The government does, however, respect the rights of individuals to refuse vaccinations for themselves or their children for religious and even, sometimes, principal reasons. Sure, they make them jump through hoops in order to get these exemptions, but they do occur.

When people don't get vaccinated though, that can lead to a breakdown in what we call herd immunity. Before we get to that though, we need to review some basic facts about vaccines. The first is that they aren't perfect. While they do significantly decrease your chance of getting a disease if you come in contact with it, there's still a risk that you could get sick. Vaccine success as a public policy depends not only on the added protection that vaccines confer upon those who get shots, but also on the decreased likelihood that anyone's going to come into contact with the disease. That's what's known as herd immunity. Once enough people are immunized, then there really can't be an outbreak.

If enough people aren't immunized and someone gets sick, the disease can then spread. More people get it. More and more people are exposed, and that's how you get an outbreak. That's bad, but if lots of people are immunized, then even if someone gets sick, the likelihood of anyone else getting sick and spreading the disease is really low. That's good, and if there can't be an outbreak, then everyone is protected, even those who can't get vaccinated.

This is critical because there are people who are at increased risk for communicable diseases, but they can't be given shots for various reasons. Small babies, for instance, are susceptible to certain diseases, but they can't be given all vaccines. The elderly can have potentially impaired immune systems and be at higher risk for diseases, and the same goes for all immunocompromised patients who are always under the threat of infection. We get so caught up in the discussion about how vaccines protect those who get them that we sometimes fail to focus on the other important reason immunizations are important. They allow us to protect those who cannot protect themselves.

To the research. In 1995, the varicella vaccine or the chickenpox vaccine was introduced in the United States, and over time, more and more children were vaccinated. In 2011, a study was published in the "Journal of Pediatrics" that looked at how the program had affected the number of kids who died from the disease each year. The first thing the paper noted was the death from varicella went down significantly from before the vaccine was released to six years later. Then, from 2001 through 2007, the rates of death remained much lower, with just a few children dying from varicella nationally each year. What's really amazing though is that from 2004 through 2007, not one kid less than one year of age died in the United States from varicella. None. This is remarkable because we can't give the varicella vaccine to babies. It's only approved for children one year of age or older. In other words, all of those really young kids were safe not because we vaccinated them against the illness, they were safe because the other children were. Enough older kids were vaccinated to grant herd immunity to protect the babies from getting sick.

Widespread vaccination prevents outbreaks from occurring. It protects all people from getting ill. And when parents refuse vaccines for their children, they leave us at increased risk. In order to combat this threat for the last few years, some schools in New York City have been refusing to allow unvaccinated children to attend school when outbreaks occur, sometimes for weeks or more. Some parents thought that this was unfair and filed lawsuits.

Just recently though, a federal court ruled that schools have this power. The court cited the government's right to make such decisions to protect public health. Parents want to allow their kids to remain at risk by leaving them unimmunized and they get sick. The state has to take steps to prevent outbreaks from occurring. In New York, one of the few children, who developed measles earlier this year, was an unvaccinated child. The state refused to allow that child's sibling, who was also unvaccinated, to go to school. That child also developed measles. The school maintains, and it's hard to dispute, that allowing that second child to go to school would have put everyone at higher risk. People who refuse to vaccinate themselves or their children aren't just putting themselves at risk. They're putting everyone else in danger too. American courts have held, once again, that while they may have the right to the former, they don't always have the right to the latter.

There may be small errors in this transcript.

This video by Healthcare Triage features Dr. Aaron E. Carroll, a pediatrician and medical researcher.

Aug 20, 2014

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