Friday, May 3, 2019

It's time to set the record straight regarding vaccination myths

By DR. FRANK WELCH | LDH Immunization Program Medical Director

Once again, misconceptions about the safety of vaccines are making headlines. These fallacies, or “fake news” as Louisiana Sen. Bill Cassidy referred to them, come during the worst measles outbreak in the last 25 years — an outbreak mostly spread by unvaccinated individuals.

As of April 29, more than 700 measles cases have been confirmed across the United States, with the largest clusters in New York and Washington/Oregon. Fortunately, Louisiana has remained free of measles. However, measles cases are also rising globally, prompting the Centers for Disease Control and Prevention to urge Americans traveling abroad to make sure they are vaccinated.

It’s not just measles on the rise, though. Other vaccine-preventable diseases, such as whooping cough (pertussis) and mumps, have experienced a resurgence in recent years because of anti-vaccination myths that promote falsehoods about vaccines’ safety and their contents.

Vaccination myths

One of the vaccination myths making headlines claims that vaccines contain tissue from aborted fetuses. 

Sen. Cassidy himself debunked this claim recently while speaking to news media, saying, “The connection to aborted children, there is tissue from 1963, the early Sixties in which some fetal material was used to create vaccines, but that’s, what, 56 years ago. And, the Catholic Church has said that the benefits of immunization so outweigh this concern that the Catholic Church strongly recommends immunizing children.” 

No current fetal tissue is used to create vaccines. You can learn more about this topic here.

As for dispelling other myths, provides a wonderful, informative guide that aims to educate the public about vaccination and debunk the myths that have arisen. Here are the guide’s top eight myths about vaccination and why they’re false.

Myth #1: Vaccines cause autism.

The widespread fear that vaccines increase risk of autism originated with a 1997 study published by Andrew Wakefield, a British surgeon. The article was published in The Lancet, a prestigious medical journal, suggesting that the measles, mumps, rubella (MMR) vaccine was increasing autism in British children.

The paper has since been completely discredited due to serious procedural errors, undisclosed financial conflicts of interest, and ethical violations. Andrew Wakefield lost his medical license and the paper was retracted from The Lancet.

Nonetheless, the hypothesis was taken seriously, and several other major studies were conducted. None of them found a link between any vaccine and the likelihood of developing autism.

Today, the true causes of autism remain a mystery, but to discredit the autism-vaccination link theory, several studies have now identified symptoms of autism in children well before they receive the MMR vaccine. And even more recent research provides evidence that autism develops in utero, well before a baby is born or receives vaccinations.

Myth #2: Infant immune systems can’t handle so many vaccines.

Infant immune systems are stronger than you might think. Based on the number of antibodies present in the blood, a baby would theoretically have the ability to respond to around 10,000 vaccines at one time. Even if all 14 scheduled vaccines were given at once, it would only use up slightly more than 0.1% of a baby’s immune capacity. And scientists believe this capacity is purely theoretical. The immune system could never truly be overwhelmed because the cells in the system are constantly being replenished. In reality, babies are exposed to countless bacteria and viruses every day, and immunizations are negligible in comparison.

Though there are more vaccinations than ever before, today’s vaccines are far more efficient. Small children are actually exposed to fewer immunologic components overall than children in past decades.

Myth #3: Natural immunity is better than vaccine-acquired immunity.

In some cases, natural immunity — meaning actually catching a disease and getting sick– results in a stronger immunity to the disease than a vaccination. However, the dangers of this approach far outweigh the relative benefits. If you wanted to gain immunity to measles, for example, by contracting the disease, you would face a 1 in 500 chance of death from your symptoms. In contrast, the number of people who have had severe allergic reactions from an MMR vaccine, is less than one-in-one million.

Myth #4: Vaccines contain unsafe toxins.

People have concerns over the use of formaldehyde, mercury or aluminum in vaccines. It’s true that these chemicals are toxic to the human body in certain levels, but only trace amounts of these chemicals are used in FDA approved vaccines. In fact, according to the FDA and the CDC, formaldehyde is produced at higher rates by our own metabolic systems and there is no scientific evidence that the low levels of this chemical, mercury or aluminum in vaccines can be harmful. See section III of this guide to review safety information about these chemicals and how they are used in vaccines.

(Note: Mercury, or thimerosal, was removed from all childhood vaccines in 2001 and was never a component of the MMR vaccine.)

Myth #5: Better hygiene and sanitation are actually responsible for decreased infections, not vaccines.

Vaccines don’t deserve all the credit for reducing or eliminating rates of infectious disease. Better sanitation, nutrition, and the development of antibiotics helped a lot too. But when these factors are isolated and rates of infectious disease are scrutinized, the role of vaccines cannot be denied.

One example is measles in the United States. When the first measles vaccine was introduced in 1963, rates of infection had been holding steady at around 400,000 cases a year. And while hygienic habits and sanitation didn’t change much over the following decade, the rate of measles infections dropped precipitously following the introduction of the vaccine, with only around 25,000 cases by 1970. Another example is Hib disease. According to CDC data, the incidence rate for this malady plummeted from 20,000 in 1990 to around 1,500 in 1993, following the introduction of the vaccine.

Myth #6: Vaccines aren’t worth the risk.

Despite parent concerns, children have been successfully vaccinated for decades. In fact, there has never been a single credible study linking vaccines to long term health conditions.

As for immediate danger from vaccines, in the form of allergic reactions or severe side effects, the incidence of death are so rare they can’t even truly be calculated. For example, only one death was reported to the CDC between 1990 and 1992 that was attributable to a vaccine. The overall incidence rate of severe allergic reaction to vaccines is usually placed around one case for every one or two million injections.

Myth #7: Vaccines can infect my child with the disease it’s trying to prevent.

Vaccines can cause mild symptoms resembling those of the disease they are protecting against. A common misconception is that these symptoms signal infection. In fact, in the small percentage (less than 1 in one million cases) where symptoms do occur, the vaccine recipients are experiencing a body’s immune response to the vaccine, not the disease itself. There is only one recorded instance in which a vaccine was shown to cause disease. This was the Oral Polio Vaccine (OPV) which is no longer used in the U.S. Since then, vaccines have been in safe use for decades and follow strict Food and Drug Administration (FDA) regulations.

Myth #8: We don’t need to vaccinate because infection rates are already so low in the United States.

Thanks to “herd immunity,” so long as a large majority of people are immunized in any population, even the unimmunized minority will be protected. With so many people resistant, an infectious disease will never get a chance to establish itself and spread. This is important because there will always be a portion of the population – infants, pregnant women, elderly, and those with weakened immune systems – that can’t receive vaccines.

But if too many people don’t vaccinate themselves or their children, they contribute to a collective danger, opening up opportunities for viruses and bacteria to establish themselves and spread.

Not to mention, as the Centers for Disease Control and Prevention (CDC) warns, international travel is growing quickly, so even if a disease is not a threat in your country, it may be common elsewhere. If someone were to carry in a disease from abroad, an unvaccinated individual will be at far greater risk of getting sick if he or she is exposed.

Seek reliable resources

My colleague Dr. Joseph Kanter, the assistant state health officer for the Louisiana Department of Health, in a recent interview said he advises parents to seek reliable sources of information regarding vaccines, such as the CDC and the World Health Organization (WHO), and in particular their children’s pediatrician.

“There’s just a lot of lies and misinformation out there and I really hate to see more parents fall victim to it,” Dr. Kanter said. I couldn’t agree more.

The bottom line is this: Vaccines are safe. Vaccines are effective. Don’t fall victim to the falsehoods.

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