Tag: anti-vaccine math

Dr. Bob Puts the Nail in the Coffin of the Herd Immunity Argument

Dr. Bob Sears, who actually wrote a book about vaccines, seems to think that he and his podcasting sidekick have put the nail in the coffin “of trying to use the herd immunity argument to justify coerced vaccinated.”

Dr. Bob seems to think that herd immunity doesn't apply to vaccines.

The meme he shared even includes the hashtag stating that herd immunity doesn’t apply to vaccines.

Dr. Bob Puts the Nail in the Coffin of the Herd Immunity Argument

While arguing against the idea of herd immunity and for coerced vaccination are common among anti-vaccine folks, neither is true.

Herd immunity is real and no-one is going to force anyone to vaccinate their kids. Vaccine mandates do not mean forced vaccination.

What about the idea that “all vaccines wane within about 2-15 years, leaving vaccinated children & adults unprotected?”

If that were true, then wouldn’t everyone who got sick in latest outbreaks be vaccinated? Why are most folks unvaccinated?

So we are either getting a lot of outbreaks because of waning immunity or your titers are getting boosted because you are getting exposed to so much natural disease. Got it?

While waning immunity is an issue for some vaccines, like mumps and pertussis, the primary and secondary failure rates are still not as bad as Dr. Bob suggests, which is why, in an outbreak, the attack rate of disease is always higher among those who are unvaccinated and unprotected.

The numbers don't always add up correctly when anti-vax folks try to do math.
The numbers don’t always add up correctly when anti-vax folks try to do math.

Is herd immunity the main argument that’s made when experts suggest we need stronger vaccine laws? I always thought the main argument is that folks should just vaccinate and protect their kids, but maintaining herd immunity so that your intentionally unvaccinated kids don’t put everyone else at risk is a good reason too.

Does everyone see the problem with Melissa Floyd’s math? This probably won’t be on the SAT, but you still want to get this right…

Like many others are doing right now, she used state level data. Since many of the folks who don’t vaccinate their kids cluster together in the same communities and schools, the “2% of those filing for exemptions” end up making up 10, 20, or even 30% of some school’s student population.

“This means if you are a primary non-responder, you are walking around every day with a false sense of security, clinically unvaccinated for that particular disease.”

Melissa Floyd

This is the whole point of herd immunity!

Because vaccines aren’t 100% effective, we can walk around all day without actually thinking about it much, hoping that we can rely on the fact that most other people are also vaccinated and protected. That keeps disease out of our community or herd.

The system typically breaks down though, not because vaccines aren’t effective enough, but because too many folks don’t get vaccinated.

“A 2011 article in “Vaccines”, edited by Stanley Plotkin, says, “Much of the early theoretical work on herd immunity assumed that vaccines induced solid immunity against infection…” Theoretical… Assumed…”

Melissa Floyd

She should have read the whole article, or at least used the whole quote…

“Much of the early theoretical work on herd immunity assumed that vaccines induce solid immunity against infection and that populations mix at random, consistent with the simple herd immunity threshold for random vaccination of Vc = (1-1/R0), using the symbol Vc for the critical minimum proportion to be vaccinated (assuming 100% vaccine effectiveness). More recent research has addressed the complexities of imperfect immunity, heterogeneous populations, nonrandom vaccination, and freeloaders.”

Herd Immunity: A Rough Guide

It doesn’t say what she thinks it says…

“Indeed, one might argue that herd immunity, in the final analysis, is about protecting society itself.”

Herd Immunity: A Rough Guide

So why haven’t we eradicated measles like we said we would?

“What’s funny is after the measles vaccine was licensed in 1963, the medical community declared a goal of eradicating measles by 1967. But 1967 came and went and it still wasn’t gone, 1977, 1987, 2000… the dates kept getting pushed, and the result was always the same. Meanwhile they continued to increase the hypothesized “herd immunity threshold”, eventually winding up at the extremely high 95% you hear today. “

Melissa Floyd

That’s actually a good question.

What happened to the previous goals of eliminating measles?

“In 1966, the USA began an effort to eradicate the disease within its own borders. After a series of successes and setbacks, in 2000, 34 years after the initial goal was announced, measles was declared no longer to be endemic in the USA.”

Orenstein et al on Eradicating measles: a feasible goal?

Along the way, we have gone from an estimated 100 million cases and 5.8 million deaths in 1980 and an estimated 44 million cases and 1.1 deaths in 1995 to “just” 7 million cases and 89,780 deaths in 2016.

“Under the Global Vaccine Action Plan, measles and rubella are targeted for elimination in five WHO Regions by 2020.”

Measles

While there is doubt that we can truly eradicate measles with the current vaccine, we can certainly control and eliminate measles if folks stop listening to anti-vaccine propaganda and they get vaccinated and protected.

More on Dr. Bob and His Herd Immunity Arguments

What Happens When You Research the Disease?

We know how anti-vaccine folks think.

Anti-vaccine math…

And now we know how they do their research

How Anti-Vaccine Folks Research Disease

If you’re like me, you are probably wondering why they picked 2016 as the year to research.

Why look just at 2016?

And, there you see it.

In the past 6 years, 2016 was the year with the fewest cases of measles. Why not choose 2017 or 2018 to do their research?

But let’s look at 2016, even though the information isn’t complete:

  • 86 cases
  • cases in 19 states, including Alabama, Arizona, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Massachusetts, Michigan, Minnesota, New York, North Carolina, Oregon, Tennessee, Texas, and Utah
  • a large outbreak in Arizona (31 cases) linked to a private detention center and all that is known is that 7 of 9 staff members who got measles had received at least one dose of MMR, and 3 had received their dose very recently
  • a large outbreak in Shelby County, Tennessee, at least 7 cases, including 6 unvaccinated and one partially vaccinated child
  • a large measles outbreak (17 cases) in Los Angeles County and Santa Barbara County that was linked to the Los Angeles Orthodox Jewish community
  • two cases in Colorado, including an unvaccinated toddler and an unvaccinated adult – outbreaks which cost at least $68,192 to control

And of th cases in 2016, it seems that just 16% were vaccinated.

What about the claim that 26% were vaccinated?

That wasn’t 26% of the total number of cases, but rather 26% of the cases among US residents.

So if you do the math, that’s just 14 cases that were vaccinated, and out of 86 cases, that’s really just 16%. And a lot of those cases are skewed by the one outbreak at the detention center, in which they may have only received one dose of MMR and nearly half may have gotten vaccinated after the caught had already started!

What about the claim that “the odds of dying from the measles are like 0.00000013%” using numbers “before the vaccine was introduced in 1963?”

“Before a vaccine became available in 1963, measles was a rite of passage among American children. A red rash would spread over their bodies. They would develop a high fever. Severe cases could cause blindness or brain damage, or even death.”

CDC says measles almost eliminated in U.S.

In the pre-vaccine era, your odds of getting measles were very high. Remember, everyone eventually got measles.

And looking at statistics of reported measles cases and reported measles deaths, we know that death occurred in about 1 to 3 in every 1,000 reported cases.

So everyone got measles, but not everyone survived having measles.

Even if you use a more liberal count of 1 death in 10,000 cases, when all kids get measles, that’s a lot of deaths. Remember, about 450 people used to die with measles each year.

What about your odds of dying with measles now?

If you are fully vaccinated, then they are extremely low.

They are pretty low if you are unvaccinated too, in most cases, because you are benefiting from herd immunity and the fact that most folks around you are vaccinated, reducing your risk of being exposed to measles. Still, the risk is much higher than most anti-vaccine folks expect, because they often make the mistake of using the entire population of the United States in their calculations. They should instead just use the folks who are unvaccinated and susceptible, a much smaller number.

Want to increase your risk?

  • travel out of the country
  • hang out in a cluster with other unvaccinated people
  • stay unvaccinated

The odds aren’t in your favor to avoid measles if you are unvaccinated. Eventually, your luck might run out.

Starting to see the mistakes anti-vaccine folks make when they say they have done their research?

“How do they know how many people would have gotten measles and how many of them would have died?!?”

It’s not rocket science.

It’s epidemiology.

“We constructed a state-space model with population and immunisation coverage estimates and reported surveillance data to estimate annual national measles cases, distributed across age classes. We estimated deaths by applying age-specific and country-specific case-fatality ratios to estimated cases in each age-country class.”

Simons et al on Assessment of the 2010 global measles mortality reduction goal: results from a model of surveillance data.

Unfortunately, after years of improvements, measles deaths increased in 2017. And they will continue to increase, as our risk of getting measles continues to increase if folks don’t get vaccinated and protected.

Lastly, why does it “sound like millions of people would have died without the measles vaccine?”

Maybe because millions of people died in previous years, before they were vaccinated and protected.

Indeed, do your research, but you will find that vaccine-preventable diseases aren’t as mild as anti-vaccine folks believe. That’s why it is important to get vaccinated and protected.

More on Researching Vaccine-Preventable Disease

Propaganda Busting Confirms Anti-vaccine Sites Photoshop Images

Spend a few minutes going through our list of anti-vaccine PRATTs, and you will quickly realize that they just push misinformation and propaganda.

Propaganda Busting Confirms Anti-vaccine Sites Photoshop Images

How easy is it to refute their claims?

Consider this “article” about measles outbreaks

It shows an infant with chicken pox.

While that could be a simple mistake, it is actually a Photoshopped stock image of an infant with chicken pox that adds a big scary needle and syringe, that I guess is supposed to represent a vaccine.

Where's the syringe and needle?
Where’s the syringe and needle?

The thing is, neither the chicken pox nor MMR vaccine look like that and neither would be given with such a long needle!

In fact, that needle is about twice the size as any needle that would be used on an infant or toddler, which is why they had to Photoshop a separate photo of a big syringe and needle onto the infant with chicken pox.

It's just a stock image of a big syringe and needle...
It’s just a stock image of a big syringe and needle…

Now that you know that the photo is make-believe, you shouldn’t be surprised that their “article” is too.

This erroneous thinking has led the public, media and government alike to attribute the origin of measles outbreaks, such as the one reported at Disney in 2015 (and which lead to the passing of SB277 that year, stripping vaccine exemptions for all but medical reasons in California), to the non-vaccinated, even though 18% of the measles cases occurred in those who had been vaccinated against it — hardly the vaccine’s two-dose claimed “97% effectiveness.”

Government Research Confirms Measles Outbreaks Are Transmitted By The Vaccinated

By itself, the number of cases in an outbreak doesn’t exactly tell you a vaccine’s effectiveness. You also have to know something about how many people were vaccinated and unvaccinated and the attack rate, etc.

“Among the 110 California patients, 49 (45%) were unvaccinated; five (5%) had 1 dose of measles-containing vaccine, seven (6%) had 2 doses, one (1%) had 3 doses, 47 (43%) had unknown or undocumented vaccination status, and one (1%) had immunoglobulin G seropositivity documented, which indicates prior vaccination or measles infection at an undetermined time.”

Measles Outbreak — California, December 2014–February 2015

Anyway, in the Disneyland outbreak, if you do the math correctly, you can see that only 8 of 110 were fully vaccinated, or about 7%.

What does that tell you about vaccine effectiveness?

Not much!

Again, we don’t know how many vaccinated vs unvaccinated folks were exposed and didn’t get measles.

We can guess though…

Most folks are vaccinated, even in California. So the fact that only 7% of the people that got measles in the outbreak were fully vaccinated actually says quite a lot about how effective the MMR vaccine really is.

What about the idea that vaccinated people are starting outbreaks and spreading measles?

While the vast majority of measles outbreaks are in fact traced to someone who is unvaccinated, there was one outbreak in 2011 that was “started” by someone who was vaccinated.

“She had documentation of receipt of MMR vaccination at 3 years and 4 years of age. There was no travel during the incubation period and no known sick contacts. However, the index patient worked at a theater frequented by tourists.”

Outbreak of Measles Among Persons With Prior Evidence of Immunity, New York City, 2011

Since even the MMR vaccine isn’t 100% effective, is it really so surprising that occasionally, someone who received two doses of the vaccine could get measles and pass it to others, especially considering that around 220 people got measles in the United States that year?

“During 2011, a provisional total of 222 measles cases were reported from 31 states… Most patients were unvaccinated (65%) or had unknown vaccination status (21%). Of the 222, a total of 196 were U.S. residents. Of those U.S. residents who had measles, 166 were unvaccinated or had unknown vaccination status, 141 (85%) were eligible for MMR vaccination, 18 (11%) were too young for vaccination, six (4%) were born before 1957 and presumed immune, and one (1%) had previous laboratory evidence of presumptive immunity to measles.”

Measles — United States, 2011

Is the MMR vaccine a failure because there were some still some outbreaks in the 1980s, before we started to give kids a second dose? The attack rate in many of these school outbreaks, in which many kids had one dose of MMR, was still only about 2 to 3%.

It is safe to blame a failure to vaccinate and intentionally unvaccinated kids for most of the recent measles outbreaks.

Is the MMR vaccine a failure because we still have outbreaks among intentionally unvaccinated kids and every once in a while, in someone who is fully vaccinated who gets caught up in an outbreak?

Of course not!

It is easy to do a little research, consider what disease rates looked like in the pre-vaccine era, and know that vaccines work and that they are necessary.

More on Propaganda Busting Confirms Anti-vaccine Sites Photoshop Images

Do More Vaccinated or Unvaccinated Kids Get Pertussis?

While this seems like a simple question, the answer is a bit more complicated than most people imagine.

Do More Vaccinated or Unvaccinated Kids Get Pertussis?

For anti-vaccine folks, the answer is clear – more vaccinated kids get pertussis. They put all of the blame for pertussis outbreaks on waning immunity. Of course, that’s not the whole story.

While 10% of kids got pertussis, unless you are at a Waldorf school, it is unusual to find that many completely unvaccinated children.
While 10% of kids got pertussis, unless you are at a Waldorf school, it is unusual to find that many completely unvaccinated children. Plus, we don’t know the vaccine history of 40% of these kids.

While it might technically be true that more vaccinated kids get pertussis in the average outbreak, that’s only because there are many more vaccinated kids!

A more accurate and useful answer, taking into account attack rates, makes it clear that a higher percentage of unvaccinated kids get pertussis in these outbreaks.

“In conclusion we have described a school-based outbreak of pertussis that may have been fueled by moderate vaccine effectiveness combined with a failure to vaccinate.”

Terrenella et al on Vaccine effectiveness of tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine during a pertussis outbreak in Maine

In a pertussis outbreak in Maine, attack rates were much higher in unvaccinated kids, even though more vaccinated kids got pertussis. While 29 of 214 vaccinated kids got pertussis, a much higher percentage of unvaccinated kids got sick – 6 of 28.

That means your risk of getting pertussis was much higher if you were unvaccinated.

A 2013 pertussis outbreak in Florida is a good example that even with all the bad press it gets, the DTaP and Tdap vaccines work too. This outbreak was started by an unvaccinated child at a charter school with high rates of unvaccinated kids. About 30% of unvaccinated kids got sick, while there was only one case “in a person who reported having received any vaccination against pertussis.”

In another 2013 pertussis outbreak in Florida, this time in a preschool, although most of the kids were vaccinated, the outbreak started with “a 1-year-old vaccine-exempt preschool student.” And the classroom with the highest attack rate, was “one in which a teacher with a laboratory-confirmed case of pertussis who had not received a Tdap booster vaccination, worked throughout her illness.”

Why do so many unvaccinated kids get pertussis these days?

“We found evidence of an increase in exemption rates, spatial clustering of nonmedical exemptions, and space-time clustering of pertussis in Michigan. There was considerable overlap between the clusters of exemptions and the clusters of pertussis cases.”

Omer et al on Geographic Clustering of Nonmedical Exemptions to School Immunization Requirements and Associations With Geographic Clustering of Pertussis

Besides the fact that they are unvaccinated and unprotected?

“Children of parents who refuse pertussis immunizations are at high risk for pertussis infection relative to vaccinated children. Herd immunity does not seem to completely protect unvaccinated children from pertussis.”

Glanz et al on Parental refusal of pertussis vaccination is associated with an increased risk of pertussis infection in children.

They can’t get away with hiding in the herd.

Another important consideration – in addition to the fact that more unvaccinated kids get pertussis, when they get pertussis, it is more severe than those who are vaccinated.

“Serious pertussis symptoms and complications are less common among age-appropriate number of pertussis vaccines (AAV) pertussis patients, demonstrating that the positive impact of pertussis vaccination extends beyond decreasing risk of disease.”

McNamara et al on Reduced Severity of Pertussis in Persons With Age-Appropriate Pertussis Vaccination-United States, 2010-2012.

Still thinking of skipping or delaying your child’s pertussis vaccine?

More on Do More Vaccinated or Unvaccinated Kids Get Pertussis?

Do Kids Really Get 72 Doses of Vaccines?

Most parents vaccinate their kids according to the recommended immunization schedule.

They know that’s the best way to keep them protected.

Do Kids Really Get 72 Doses of Vaccines?

Saying kids get 72 doses of vaccines is a propaganda too to scare parents.
Saying kids get 72 doses of vaccines is a propaganda tool to scare parents.

While kids do get more vaccines than their parents did, that’s only because we have more vaccines available to protect them from more now vaccine-preventable diseases.

Do they get their kids 72 doses of vaccines?

That sounds like a lot…

It sounds like a lot because it is an inflated number that is meant to scare parents.

Kids today do routinely get:

  • 13 vaccines, including 5 doses of DTaP, 4 doses of IPV (polio), 3 or 4 doses of hepatitis B, 3 or 4 doses of Hib (the number of doses depends on the vaccine brand used), 4 doses of Prevnar, 2 or 3 doses of rotavirus (the number of doses depends on the vaccine brand used), 2 doses of MMR, 2 doses of Varivax (chicken pox), 2 doses of hepatitis A, 1 doses of Tdap, 2 or 3 doses of HPV (the number of doses depends on the age you start the vaccine series), 2 doses of MCV4 (meningococcal vaccine), and yearly influenza vaccines
  • protection against 16 vaccine-preventable diseases, including diphtheria, tetanus, pertussis, measles, mumps, rubella, polio, chicken pox, pneumococcal disease, hepatitis A, hepatitis B, meningococcal disease, HPV, rotavirus, Hib, and flu
  • about 28 doses of those vaccines by age two years (with yearly flu shots)
  • about 35 doses of those vaccines by age five years (with yearly flu shots)
  • as few as 23 individual shots by age five years if your child is getting combination vaccines, like Pediarix or Pentacel and Kinrix or Quadracel and Proquad
  • about 54 doses of those vaccines by age 18 years, with a third of that coming from yearly flu vaccines

How do you get a number like 72?

You can boost your count to make it look scarier by counting the DTaP, MMR, and Tdap vaccines as three separate vaccines each, even though they aren’t available as individual vaccines anymore.

To boost the Vaccine Doses for Children a bit more, they add pregnancy doses too.
To boost the Vaccine Doses for Children a bit more, they add pregnancy doses too.

This trick of anti-vaccine math quickly turns these 8 shots into “24 doses.”

It’s not a coincidence.

Anti-vaccine folks want to scare you into thinking that vaccines are full of toxins, that kids get too many vaccines, that we give many more vaccines than other countries, and that this is causing our kids to get sick.

Can an unvaccinated child really get tetanus after a toe nail injury?
Can an unvaccinated child really get tetanus after a toe nail injury? Photo by Petrus Rudolf de Jong (CC BY 3.0)

None of it is true.

At age four years, when your preschooler routinely gets their DTaP, IPV, MMR, and chicken pox shots before starting kindergarten, how many vaccines or doses do you think they got? Two, because they got Kinrix or Quadracel (DTaP/IPV combo) and Proquad (MMR/chickenpox combo)? Four, because they got separate shots? Or Eight, because you think you should count each component of each vaccine separately?

Know that even if you do want to count them separately, it really just means that with those two or four shots, your child got protection against eight different vaccine-preventable diseases – diphtheria, tetanus, pertussis, polio, measles, mumps, rubella, and chicken pox.

Vaccine-preventable diseases that have not disappeared, something that the “72 doses” sites don’t ever warn you about.

What to Know About Anti-Vaccine Math

Many websites use anti-vaccine math to inflate vaccine dose numbers and scare parents away from vaccinating and protecting their kids.

More on Anti-Vaccine Math

Four Generations of Vaccines and Vaccine Preventable Diseases

This image that has been floating around the Internets conveys a lot of information, both about vaccines and vaccine-preventable diseases. And about the propaganda being pushed by the anti-vaccine movement.

Four generations of vaccines or vaccine misinformation?
Four generations of vaccines or vaccine misinformation?

A lot has changed over the last four generations…

Four Generations of Vaccine Preventable Diseases

In the United States, we have seen:

  • 1949 – the last smallpox outbreak
  • 1970s – the last outbreak of respiratory diphtheria
  • 1979 – endemic polio was declared eliminated
  • 1979 – smallpox was declared eradicated
  • 2000 – endemic measles was declared eliminated
  • 2000- neonatal tetanus was declared eliminated
  • 2004 – endemic rubella and congenital rubella syndrome were declared eliminated
  • 2009 – endemic respiratory diphtheria was declared eliminated

But there hasn’t been as much change as some folks think.

Four Generations of Vaccines

For one thing, kids don’t get 69 vaccines today as part of the recommended immunization schedule.

We don’t even have 69 vaccines available to give children today!

And while 200+ vaccines are being tested or are in the “pipeline,” very few will end up on the childhood immunization schedule. For example, many of these are therapeutic vaccines to treat cancer, allergies, and other conditions. And a lot of the other pipeline vaccines are for the same infectious disease, including 36 vaccines being tested to prevent or treat HIV and 25 to prevent the flu.

So how many vaccines do kids actually get?

Kids today routinely get 13 vaccines to protect them from 16 vaccine-preventable diseases. More than 13 vaccines are available, but some aren’t used in the United States and some are only used in special situations or for high risk kids.

Also, looking at historical immunization schedules, it is clear that folks in the 1940s and 50s didn’t get just two vaccines.

schedule1940s
A schedule of immunizations from a 1948 AAP Round Table Discussion on the Practical and Immunological Aspects of Pediatric Immunizations

Did some kids really get annual tetanus and typhoid vaccine boosters back then?

It’s possible, after all, by the 1930s, we did have individual vaccines against diphtheria, tetanus, pertussis, typhoid, and smallpox.

This was followed by:

  • 1948 – the individual diphtheria, tetanus, and pertussis vaccines become combined in a single DTP vaccine
  • 1955 – first polio vaccine – IPV
  • 1962 – change to oral polio vaccine – OPV
  • 1963-68 – first measles vaccines
  • 1967 – first mumps vaccine
  • 1969 – first rubella vaccine
  • 1971 – the individual measles, mumps, and rubella vaccines become combined in a single MMR vaccine
  • 1972 – routine vaccination with smallpox vaccines end in the US

The next big change was the addition of the Hib vaccine to the schedule in 1985.

“…for those trained in pediatrics in the 1970s, Hib (Haemophilus influenzae type b) was a horror.”

Walter Orenstein, MD

This was followed in 1989, with the addition of the hepatitis B vaccine, expanded age ranges for Hib, and the start of the switch to DTaP.

By 2000, kids got protection against 11 vaccine-preventable diseases, and routinely got the DTaP, MMR, IPV, Hib, chicken pox, Prevnar, hepatitis B, and Td vaccines.

Over the years, vaccines and protection against rotavirus, hepatitis A, meningococcal bacteria, HPV, and a yearly flu shot were added to the schedule.

We still haven’t gotten to 69 vaccines though.

Looking at the latest immunization schedule from the CDC and AAP, it should be clear that kids don't get 69 vaccines.
Looking at the latest immunization schedule from the CDC and AAP, it should be clear that kids don’t get 69 vaccines.

Kids today do routinely get:

  • 13 vaccines, including DTaP, IPV (polio), hepatitis B, Hib, Prevnar 13, rotavirus, MMR, Varivax (chicken pox), hepatitis A, Tdap, HPV, MCV 4 (meningococcal vaccine), and influenza
  • protection against 16 vaccine-preventable diseases, including diphtheria, tetanus, pertussis, measles, mumps, rubella, polio, chicken pox, pneumococcal disease, hepatitis A, hepatitis B, meningococcal disease, HPV, rotavirus, Hib, and flu
  • about 28 doses of those vaccines by age two years
  • about 35 doses of those vaccines by age five years
  • as few as 23 individual shots by age five years if your child is getting combination vaccines, like Pediarix or Pentacel and Kinrix or Quadracel and Proquad
  • about 54 doses of those vaccines by age 18 years, with a third of that coming from yearly flu shots

How do you get a number like 69?

You can boost your count to make it look scarier by counting the DTaP, MMR, and Tdap vaccines as three separate vaccines each (even though they aren’t available as individual vaccines anymore). That quickly turns 8 shots into “24 vaccines.”

You can’t count them each as three vaccines today, but just as one when mom, grandma and great-grandma got them. If you are counting individual components of those vaccines, then great-grandma didn’t just get two vaccines, especially when you consider that she almost certainly would have gotten multiple doses of the DPT vaccine.

Paradoxically, even more antigens have been taken off the schedule with the removal of the smallpox and DPT vaccines. In 1960, kids got exposed to 3,217 different antigens from the smallpox, polio, diphtheria, tetanus and whole cell pertussis vaccines. All of today’s vaccines on the schedule expose them to just 177 different antigens!

Why does that matter? It is the antigens that are stimulating the immune system, so if you were really concerned about a number, that would be the one to look at.

More Vaccines Equal More Protection

Of course, the number of vaccines kids get and how they have increased over time is very important. But not in they way anti-vaccine folks like to think.

It is important because kids today are protected against and don’t have to worry about the consequences of many more life-threatening diseases, like bacterial meningitis (Hib and the pneumococcal bacteria), epiglottitis (Hib), liver failure and liver cancer (hepatitis B), severe dehydration (rotavirus), and cervical cancer (HPV), etc.

If you think kids get too many vaccines today, then you have no idea what things were like in the pre-vaccine era.

More on The Evolving Immunization Schedule