Skeptical Raptor's Blog hunting pseudoscience in the internet jungle

Multiple immunizations weaken children’s immune system–debunking myths

If you explore the dark and myth filled back alleys of the antivaccination movement, you will find a wide variety of myths that try to convince people that vaccinating children is dangerous. I’ve covered and refuted many of the myths, although the vaccine deniers tend to rely on zombie myths that keep returning over and over again, never quite dying. Those myths range from outrageous, such as it’s a conspiracy of the government to control population (which I find odd, since the government is barely competent enough to build a post office), to scientific sounding, but ultimately pseudoscientific claims. There are a lot of great websites that debunk many of the myths, and they’re easy to find. 

One of the most annoying legends of the antivaccination lunacy is that there are too many immunizations for the poor baby’s tender immune system. About that immune system? It’s comparatively strong relative to almost every other organ system in the body. 


educate before you vaccinateOne of the big proponents of the alternative vaccination is schedule is Dr. Bob Sears, who pushes the myth is that there are a lot of vaccinations. And tries to sell a lot of nonsense on his website, but that’s a different story. The meme to the left is one that promoted by a lot of vaccine deniers (or again, vaccine delayers) that the number of vaccines has increased over the years. And, yes it has, partially because we have a lot of new vaccines since the 1980’s, but also, we have more scientific evidence that has fine-tuned the vaccine schedule to prevent diseases that can harm.

This unscientific myth has it’s basis on a belief that somehow all of these vaccines are going to damage the immune system, because “that’s just too many antigens for the young child’s immune system.” Or the vaccine deniers/delayers invent preposterous claims these excess vaccines “use up” the immune system (yes, use up). Or that because vaccines aren’t natural, they mess up the immune system. I’m sure there are other anti-scientific claims, I may not have looked hard enough.

Of course, I’d like to see the evidence for these claims. Anyone? Is there a peer-reviewed paper somewhere that establishes that anyone, a baby, child or adult, other than those with chronic diseases, has an immune system that cannot tolerate the extremely low number of antigens from vaccines?


Science and clinical trials tell us a completely different story.

  • Mark Crislip, in the Quackwatch article, Do Children Get Too Many Immunizations? The Answer is No stated that, “delaying vaccines increases the time during which children are susceptible to certain diseases, some of which are still fairly common. Chickenpox, whooping cough, influenza, and pneumococcus still cause hospitalizations and deaths in previously healthy children. Spacing out or separating vaccines will also require more doctor visits, which will increase overall costs as well as the number of times the children must experience any associated discomfort and stress.”
  • Paul A. Offit, MD Charlotte A. Moser, BS concluded that, “at the heart of the problem with Sears’ schedules is the fact that, at the very least, they will increase the time during which children are susceptible to vaccine-preventable diseases. If more parents insist on Sears’ vaccine schedules, then fewer children will be protected, with the inevitable consequence of continued or worsening outbreaks of vaccine-preventable diseases. In an effort to protect children from harm, Sears’ book will likely put more in harm’s way.”
  • Once again, Crislip, in the Science Based Medicine article Alternative Vaccination Schedules opined that, “the preponderance of information in the medical literature on vaccinations is as clear as any topic in medicine.  Vaccines are effective and they are safe.  The best bet for keeping your child, and your community, healthy is to get vaccinated and to do it on schedule.  There are people who see the issue differently, and is often the case, the reasons are more subtle and complicated that one would except.  And there is still much to be understood as to why people do and do not participate in the vaccination schedule.”

Those links will provide you with great deconstructions of the “too many vaccination” myths. But let’s make it even simpler, at least to demolish the myth that somehow all of those vaccines are going to overwhelm the child’s immune system. In this paper, the researchers discovered that:

  • In each cubic meter of air, there are between 1.6 million and 40 million viruses.
  • In each cubic meter of air, there are between 860,000 and 11 million bacteria.

A child inhales about 5 liters of air per minute (or about .005 cubic meters), so a few hundred thousand viruses and bacteria are inhaled every minute. And the researchers discovered that many were unknown species, so the immune system has to adapt to them with each breath. Thus, the 25-30 antigens from vaccines (depending on the age of the child and the number of different flu vaccines that they’ve received) is not even a significant number compared to the millions upon millions of viral and bacterial antigens that enter a child’s lungs every day or week. Vaccine antigens barely register on the immune system’s massive scale of power in dealing with antigens.

The antivaccination cultists fail to realize the incredible power of the immune system. It “memorizes” literally billions, if not orders of magnitude more numbers, of antigens. The handful of antigens contained by vaccines are critical because of their virulence and danger to human health of those particular pathogens–the immune system just adds that information into its memory bank, it doesn’t get overwhelmed by it.

The complicated and powerful immune system doesn’t get weakened by the “knowledge” from the vaccines. It just moves on to the next antigen, one of the few million that it sees every day. The immune system does not get weaker, unless you have chronic diseases or malnutrition. You can’t make it stronger, but vaccines cause it to adapt to that particular antigen, so that it “remembers” what to do the next time it encounters that antigen.


This is easy. Vaccines simply cause the development of adaptive immunity to a pathogen or antigen. This is something that happens millions of times a day in a healthy child, teenager, and adult. If the vaccine denialists could bring one tiny bit of evidence that vaccines did something different than cause that adaptive immunity, then we could talk. But they can’t.

As Paul Offit summarized in Addressing Parents’ Concerns: Do Multiple Vaccines Overwhelm or Weaken the Infant’s Immune System?:

Current studies do not support the hypothesis that multiple vaccines overwhelm, weaken, or “use up” the immune system. On the contrary, young infants have an enormous capacity to respond to multiple vaccines, as well as to the many other challenges present in the environment. By providing protection against a number of bacterial and viral pathogens, vaccines prevent the “weakening” of the immune system and consequent secondary bacterial infections occasionally caused by natural infection.

So more evidence that vaccines do not do what vaccine deniers claim they do. And they do precisely what scientists think they do–save lives.


If you need to search for accurate information and evidence about vaccines try the Science-based Vaccine Search Engine.


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Comments (14)
  • Someone

    You have not provided any evidence in this small minded post that vacciantion does not cause weakening of the immune system. Why don’t you watch a few of dr Suzanne Humphries presentations or dr Russell Blaylock then come back and try to say vaccination is always safe and risk free. No child in a natural setting would acquire diphtheria, pertussis, hep b, pneumonia, hib, etc. All in the same day. These diseases would never enter the body through the largest organ of the body called the skin. The normal process of infection would be through the nasal passages, mouth or eyes. In this respect the body would respond properly. The immune system IS imbalanced due to vaccination making it susceptible to autommunity and allergies. Man is not smarter than nature! Remember that!!!!

    • notation

      You are truly incredibly stupid and ignorant. You have no idea what you’re talking about. I don’t doubt that you never made it through high school.

      • Someone

        I believe YOU are ignorant my friend. Many who never made it through high school are the richest , most successful and smartest in the world. Unfortunately I did make it through that government institution of indoctrination you call high school. Thank god they didn’t succeed in dumbing me down as I’m able to be an independent thinker and not follow the herd:)

        • notation

          You’re an idiot. You confuse “independent thinker” with “conspiracy theorist” because you are too dumb to understand the science-based evidence that shows how vaccines work.

          • Someone

            Don’t be jealous.

          • notation

            Don’t worry.

    • notation

      You are an ignoramus. Humphries and Blaylock? It is to laugh. They are quacks and you choose to believe them because you’re a dumbbell.

      You don’t understand how vaccines work and it shows in every word you write. Get an education.

      And stop lying. Nobody said vaccination is “risk-free.” Seat-belts aren’t risk-free, you simpleminded dolt.

      • Someone

        Anyone that speaks against the agenda is considered a quack of course…. I believe western medicine doctors to be quacks.

        • notation

          You don’t know anything about “medicine,” western or otherwise, you phony.

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