Tag: reporting vaccine side effects

What Are the Side Effects of the Flu Vaccine?

Like other vaccines, flu vaccines can have side effects.

Fortunately, most of those side effects are mild.

What Are the Side Effects of the Flu Vaccine?

Not surprisingly, a lot of things that get blamed as being caused by flu vaccines are not actually side effects.

Did you actually get the flu in the days or weeks after your flu vaccine?

That’s not a side effect of your flu vaccine. Neither the inactivated flu shot, nor the attenuated FluMist can actually cause a flu infection.

Did you get a little sore at the site where you got your flu shot?

That’s a common side effect to getting a flu shot.

So is having some redness and swelling at the site, all of which begin soon after getting the shot and go away in a few days. You can also get a headache, fever, nausea, and muscle aches or signs and symptoms of an allergic reaction.

Do you have a runny nose or a cough? Side effects of the nasal spray flu vaccine can include a few days of runny nose, wheezing, headache, vomiting, muscle aches, fever, sore throat and cough.

Again, a bad cough and cold after a flu shot isn’t a side effect of the vaccine though.

Remember, correlation does not imply causation.

If you found out you were pregnant shortly after getting a flu shot, you wouldn’t think they were associated, would you?

What about narcolepsy?

“An increased risk of narcolepsy was found following vaccination with Pandemrix, a monovalent 2009 H1N1 influenza vaccine that was used in several European countries during the H1N1 influenza pandemic.”

Narcolepsy Following Pandemrix Influenza Vaccination in Europe

Although the focus has been on the Pandemrix flu vaccine as a trigger for narcolepsy in some countries (the vaccine wasn’t used in the United States), interestingly, several countries that weren’t using the vaccine also saw a spike in narcolepsy cases as the 2009 H1N1 pandemic hit.

Doctors and pharmacies rarely give away flu shots for free. They might not charge a copay sometimes because they are getting paid by your insurance company!
Doctors and pharmacies rarely give away flu shots for free. They might not charge a copay sometimes because they are getting paid by your insurance company!

What about all of the reports of severe reactions and deaths after getting a flu shot that you might hear about? In addition to vaccine injury stories, those reports are to VAERS and typically are not causally related to getting a vaccine.

Why are there so many reports to VAERS and the NVICP about flu vaccines? Since 2006, over 1.6 trillion doses of flu vaccine have been distributed in the United States, which equals about the total of all other vaccines we use.

What Are the Side Effects of This Year’s Flu Shot

Even when folks understand that flu vaccines don’t typically cause serious side effects, the question always comes up whether or not this year’s flu shot is causing more side effects than usual.

That’s actually not unreasonable, even when you consider that the biggest change in most flu vaccines from year to year is the strain of flu viruses they include, and not any of the other ingredients.

In addition to the Pandemrix flu vaccine, in 2010, the use of one brand of flu vaccines in Australia was suspended because they were causing more side effects (fever and febrile seizures) in young children than expected.

“The studies flesh out preliminary findings from CSL in June 2012, which said that the manufacturing process retained more virus component than that of other manufacturers and that the 2010 virus components triggered an excessive immune response in some young kids.”

CSL studies shed light on 2010 flu vaccine seizures

So are there any more side effects this year?

No, there is no evidence of increased side effects from this year’s flu vaccines

More on Flu Vaccine Side Effects

Diagnosing Vaccine Injuries

Vaccines are often described as one of the greatest public health achievements of the 20th century.

That great benefit also leaves no doubt for most people that getting vaccinated and fully protected far outweighs the very small risks that vaccines might have.

Vaccine Injuries vs Vaccine Side Effects

Vaccines can certainly have side effects.

Fever, pain at the injection site, and redness and swelling where the shot was given are all common, mild problems that can be associated with almost any vaccine.

Some vaccines might also commonly cause fussiness, tiredness or poor appetite, and vomiting within 1 to 3 days of getting the vaccine. Others can cause a rash, headache, or muscle and joint pain for a few days.

Even syncope or fainting can commonly occur within 15 minutes of teens getting a vaccine.

Other vaccine side effects can include persistent crying, nodules at the injection site, limb swelling, and febrile seizures, etc.

These are well known vaccine side effects that are often minor and temporary though.

Is It a Vaccine Injury?

Although the term is typically associated with the anti-vaccine movement, as they tend to think everything is a vaccine injury, it is important to understand that vaccine injuries, although rare, are indeed real.

After all, vaccines are not 100% safe.

In addition to the milder side effects listed above, vaccines can very rarely cause more serious types of adverse events or injuries, including:

  • life threatening allergic reactions
  • brachial neuritis (shoulder pain and then weakness) following a tetanus containing vaccine
  • encephalopathy/encephalitis following a measles, mumps, or rubella, or pertussis containing vaccine
  • chronic arthritis following a rubella containing vaccine
  • thrombocytopenic purpura (ITP) following a measles containing vaccine
  • vaccine-strain measles viral infection in an immunodeficient recipient following a measles containing vaccine
  • intussusception – following a rotavirus vaccine
  • shoulder injury related to vaccine administration – SIRVA

Keep in mind that some of these are just table injuries and are not necessarily proven as being caused by vaccines.

And while vaccines are associated with some serious adverse events, the research is clear that vaccines are not associated with autism, SIDS, and shaken baby syndrome, type 1 diabetes, multiple sclerosis, inflammatory bowel disease, or other so-called vaccine induced diseases.

Or Is It Just a Coincidence?

Dr. Samuel Johnson once said that “It is incident to physicians, I am afraid, beyond all other men, to mistake subsequence for consequence.”

How does this apply to diagnosing vaccine injuries?

Too often we forget that just because one event is subsequent (happens after) another, it does not mean that it was a consequence (was caused by) the first event. It is another way of saying that correlation does not imply causation.

This is also highlighted by missed vaccine stories, events that would surely be blamed on a vaccine injury, except that a vaccine was never actually given for one reason or another.

Most pediatricians have these types of missed vaccine stories, such as:

  • an infant who begins vomiting on the way home from a well appointment and is diagnosed with intussusception (9 month old visit and didn’t get any vaccines)
  • a 4 year old who developed encephalitis just one week after his well check up (no vaccines – DTP had been deferred to his 5 year old visit)
  • a 2 month old who died of SIDS on the night of his scheduled well child visit (no vaccines as they had forgotten to go to the appointment)
  • a 4 month old who had a seizure at his well child visit (no vaccines were given yet as they were still being drawn up)

Or they have kids who begin to have symptoms or are diagnosed with a condition right around the time of a check up when they would routinely get one or more vaccines, but haven’t yet. From diabetes and POTS to transverse myelitis, some parents would have blamed their child’s vaccines if they had actually been vaccinated at that time and subsequently got diagnosed.

My own son started getting migraines when he was 12 years old and about to start 7th grade. Should I blame his headaches on his middle school booster shots? While it would be convenient, it is more likely that genetics are to blame. I started getting migraines at about the same age, and he began getting them just before he got his booster shots.

Diagnosing Vaccine Injuries

How do you know if your child had a true vaccine injury?

Does the reaction fit into the vaccine injury type AND “time period for first symptom or manifestation of onset or of significant aggravation after vaccine administration” as described in the NVICP vaccine injury tables?

That time period, also known as a risk interval, is when “individuals are considered at risk for the development of a certain adverse event following immunization (AEFI) potentially caused by the vaccine.”

For example, did your child develop an anaphylactic reaction within four hours of getting the DTaP vaccine? While a reaction 14 hours after the vaccine would be much less likely to be caused by the vaccine, if it occurred within 4 hours, that could certainly be a vaccine injury.

How about a child who developed thrombocytopenic purpura 90 days after getting his MMR vaccine? That is unlikely to be a vaccine injury, as the MMR vaccine typically causes TTP within 7 to 30 days.

If you think that your child has had a vaccine injury, be sure to talk to your pediatrician. You should also report any vaccine reaction to Vaccine Adverse Event Reporting System (VAERS) and if you truly believe that your child has been injured by a vaccine, you can file a claim with the National Vaccine Injury Compensation Program (VICP).

“You may file a claim if you received a vaccine covered by the VICP and believe that you have been injured by this vaccine.”

What You Need to Know About the National Vaccine Injury Compensation Program (VICP)

How will your pediatrician figure out if it is a vaccine injury? Among the things that they will consider when evaluating a reaction after a vaccine will be the answers to some key questions, including:

  • Is there any evidence that something else caused the reaction? While getting a vaccine could cause an anaphylactic reaction, so could the fact that your child just eat a peanut butter and jelly sandwich.
  • Is there a known causal association between the reaction and the vaccine?
  • Is there strong evidence against a causal association between the reaction and the vaccine?
  • Is there a laboratory test that implicates the vaccine as a cause of the reaction?
  • If the reaction is an infection, did it have a vaccine or wild type origin?

Your pediatrician will also consider other factors when making a decision, including whether other patients were affected (might implicate a contaminated vaccine), and will make sure that the original diagnosis is correct.

Being able to answer all of these questions often puts pediatricians in the unique position of correctly evaluating potential vaccine injuries. There is even a standardized algorithm that can help your pediatrician collect and interpret all of the data they will get when evaluating a possible vaccine injury.

Another algorithm can help evaluate and manage suspected allergic reactions, including immediate or type 1 hypersensitivity reactions and delayed type 3 hypersensitivity reactions. If the reaction is consistent with an allergic reaction and additional doses of the vaccine are still needed, possible next steps in this algorithm include serologic testing for immunity and skin testing with the vaccine or vaccine components.

For extra help, your pediatrician can consult an allergist or immunologist before considering giving your child another vaccine, if necessary. Experts at the Clinical Immunization Safety Assessment (CISA) are also available for consults about suspected vaccine injuries.

Over-Diagnosing Vaccine Injuries

In addition to vaccine side effects and vaccine injuries, it is much more common for children and adults to develop health problems and symptoms after getting a vaccine that have nothing to do with the vaccine. These are events, sometimes tragic, that would have happened even if they had not been vaccinated.

Anytime we see a post about vaccines and SIDS, we know what happened, an anti-vaccine Facebook group is taking advantage of a grieving family.
Anytime we see a post about vaccines and SIDS, we know what happened, an anti-vaccine Facebook group is taking advantage of a grieving family.

Despite the evidence against it, some parents may still think that their child has been injured or damaged by a vaccine, especially if they:

  • believe all of the vaccine injury stories they hear on the Internet
  • misuse vaccine package inserts
  • believe that VAERS reports have all been confirmed to be true
  • think that vaccine injuries can occur months or years after getting a vaccine
  • find a case report in PubMed and think that is convincing evidence of causality, even though it is really nothing more than a glorified anecdote
  • have found their way into a Facebook group where folks think vaccines always injure kids
  • go to a homeopath, chiropractor, or holistic practitioner who told them the child was injured

For example, studies have repeatedly shown that “vaccination does not increase the overall risk of sudden infant death (SIDS),” and that “the risk of SIDS in vaccinated cases and controls is neither increased nor reduced during the early post-vaccination period.”

What should you do if you really think that your child has a vaccine injury?
Just what a parent needs when their baby dies of SIDS, someone to reach out and tell them it was because they had him vaccinated… 

So a VAERS report of SIDS on the night that an infant received his 4 month vaccines, while tragic, would likely not end up being classified as a true vaccine injury.

Neither should a case report or package insert about SIDS influence your thinking about SIDS being associated with a vaccine injury.

Still, it is easy to understand why many like to blame vaccines.

Vaccines are an easy target, especially as most vaccine-preventable diseases are under fairly good control compared to the pre-vaccine era. And in some cases of SIDS, a new case of diabetes, or the sudden death of an older child, etc., it may happen soon after the child was vaccinated, and that correlation is hard to ignore for some folks.

At least it is hard to ignore and easy to be influenced by anti-vaccine folks if you don’t understand the background rate of these diseases – or the fact that a certain number of children will be affected no matter what, and because many kids get vaccinated, it is only a matter of chance that the two get correlated together. 

Vaccines are safe.

They don’t typically cause serious vaccine injuries.

If you do think that your child has a vaccine injury, talk to your pediatrician. Don’t get diagnosed in a Facebook forum…

More on Diagnosing Vaccine Injuries

Can You Really Get a Flu Shot If You Are Allergic to Eggs?

Are you still worried about your child’s egg allergy and getting them a flu vaccine?

Everyone needs a flu shot. When will you get yours?
Everyone needs a flu shot. Even kids with egg allergies. Photo by Gabriel Saldana (CC BY-SA 2.0)

That’s not surprising, as we once warned people about residual egg proteins in flu vaccines and the possibility of immediate hypersensitivity reactions in those with severe egg allergies.

Flu Vaccines and Egg Allergies

Of course, that advice has now changed, even though most flu vaccines are still prepared in chicken eggs.

“Recent studies have shown that even individuals with confirmed egg allergy can safely receive the flu vaccine. The Joint Task Force on Practice Parameters of the American Academy of Allergy Asthma and Immunology and the American College of Allergy Asthma and Immunology as well as the American Academy of Pediatrics state that no special precautions are required for the administration of influenza vaccine to egg-allergic patients no matter how severe the egg allergy.”

Egg Allergy and the Flu Vaccine

In fact, it began to change in 2011, when we got the recommendation that it was okay to give flu shots to people with egg allergies, if they only get hives as their reaction. It was still recommended that those with more severe allergic reactions to eggs “be referred to a physician with expertise in the management of allergic conditions for further risk assessment before receipt of vaccine.”

Before that, we would sometimes do skin testing on high risk egg allergic kids, desensitization, or regular chemoprophylaxis.

In 2013, the recommendation changed so that those with severe allergic reactions to eggs should get their flu shot “by a physician with experience in the recognition and management of severe allergic conditions.”

The recommendations were again modified in 2016, removing the recommendation that egg-allergic flu vaccine recipients be observed for 30 minutes and that those with severe egg allergies “should be vaccinated in an inpatient or outpatient medical setting (including but not necessarily limited to hospitals, clinics, health departments, and physician offices), under the supervision of a health care provider who is able to recognize and manage severe allergic conditions.”

Why the changing advice?

It’s because severe allergic reactions to vaccine are rare (in a million doses rare). And even in the flu vaccines that still use eggs, almost all of the egg protein is removed from the final vaccine. So that residual amount of egg protein is unlikely to trigger an allergic reaction. And that’s what we saw as the recommendations were slowly changed year after year.

Getting a Flu Shot When You Are Allergic to Eggs

And that’s why we have our current recommendations:

  • Those with a history of egg allergy who only get hives can get any age-appropriate flu vaccine.
  • Those with a history of egg allergy who have severe reactions, including angioedema, respiratory distress, lightheadedness, recurrent emesis, or who required epinephrine or another emergency medical interventions, can still get any age-appropriate flu vaccine, but they should get it in an inpatient or outpatient medical setting (such as a hospital, clinic, health department, or physician’s office). And the vaccine administration should be supervised by a health care provider who is able to recognize and manage severe allergic reactions.
  • Those who can eat eggs without reaction can get any age-appropriate flu vaccine.

Do you still have to be observed after getting your flu vaccine if you have an egg allergy?

No postvaccination observation period is recommended specifically for egg-allergic persons.

Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices—United States, 2018–19 Influenza Season

Nope. But that’s likely because although they are rare, reactions might not occur right away.

So yes, you can and you should get a flu vaccine if you are allergic to eggs.

More on Flu Vaccines and Egg Allergies

 

Anti-Vaxxers Should Be Able to Answer These Questions Correctly

There is a new meme going around suggesting that folks have no business telling anyone to vaccinate and protect their kids unless they can answer a series of questions.

I bet answers from anti-vaccine folks aren't the same as the answers from the rest of us...
I bet answers from anti-vaccine folks aren’t the same as the answers from the rest of us…

While it is certainly good to be educated about vaccines, their questions seem rather loaded.

Anti-Vaxxers Should Be Able to Answer These Questions Correctly

Since it is immoral and dangerous to push misinformation that scares parents away from vaccinating and protecting their kids, it would be nice if anti-vaccine folks would answer these questions before they tried to persuade anyone to not get vaccinated:

  1. Name 5 vaccine ingredients that you think are toxic and how exactly they can be toxic at the amounts present in vaccines.
  2. Name 5 possible complications of a vaccine-preventable disease.
  3. Are doctors and alternative health care providers who push non-standard, parent-selected, delayed protection vaccine schedules able to be held liable if their intentionally unvaccinated child suffers a vaccine-preventable disease or starts an outbreak, infecting other people?
  4. How many children died of vaccine-preventable diseases in the early 1980s, before the vaccine schedule grew to include the new vaccines we give today?
  5. Is it true that no one can force you to get vaccinated?
  6. What percentage of reports to VAERS are actually caused by vaccine reactions?
  7. How many doses of vaccines have been given since the Vaccine Court began paying for vaccine injury cases?
  8. Which vaccines must be avoided because of shedding or other concerns if you have a child with an immunodeficiency in your home?
  9. Why do some folks think that many vaccines still contain thimerosal?
  10. If today’s vaccines already contain far fewer antigens than they did in the old days, what would be the extra benefit of splitting them up even further into separate shots for each vaccine-preventable disease?
  11. Have you read all of studies on the safety and effectiveness of combination vaccines, including those that are double-blinded and placebo controlled, and the current vaccine schedule?
  12. Can you give me one other interesting fact about vaccines or vaccine-preventable diseases that was not already asked or discussed?

What’s my interesting fact?

Many on-the-fence and vaccine hesitant parents do change their mind about vaccines and decide to make the right choice and get their kids vaccinated and protected.

More Things Anti-Vaxxers Should Know

Vaccine Injuries vs Coincidences

Believe it or not, some folks don’t think that coincidences are real.

Not believing in coincidences is a well known trope of the anti-vaccine movement.
Not believing in coincidences is a well known trope of the anti-vaccine movement.

Is it a coincidence that these folks are the ones who are the most likely to believe that vaccines cause a lot of injuries and vaccine induced diseases?

Vaccine Injuries vs Coincidences

Thinking about vaccine side effects and coincidences is not new.

“When I undertook the study with the current vaccine strain on my own two triple-negative children and their three playmates, also triple- negatives, I thought: “I am going to do this very carefully now,” and, like Dr. Gear, I set up certain time schedules. I said: “I am going to start to give the vaccine now.” Every time I said “I am going to start to give it” and did not give it, two to three or four days later they came down with either pharyngitis, vomiting and abdominal pain, or a little fever.

I waited for approximately six weeks for those children to stop having some sort of febrile episode. I finally gave up. It so happened that after they got the vaccine they did not have any such episode.”

Albert Sabin on Recent Studies And Field Tests With A Live Attenuated Poliovirus Vaccine

When Albert Sabin was first researching his oral polio vaccine, he understood the problem. How could he really know if any signs or symptoms that occurred after he gave someone his vaccine were really caused by the vaccine, or just a coincidence?

“However, a report later to be given by Dr. Smorodintsev will deal with approximately 7,500 children who had received the vaccine and were carefully followed, as compared with another group, in similar number, who had not, for various types of illnesses which were occurring during the period.”

Albert Sabin on Recent Studies And Field Tests With A Live Attenuated Poliovirus Vaccine

The solution? They studied kids who had not gotten his vaccine.

But you don’t need an unvaccinated group to uncover coincidences.

You can just look at the background rate of a symptom or condition, and compare the periods before and after you start using a vaccine.

For instance, consider this study from Australia about using the HPV vaccine in boys, in which they made some predictions of what would happen after introducing the HPV vaccine.

Assuming an 80% vaccination rate with three doses per person — which equates to about 480 000 boys vaccinated and a total of 1 440 000 doses administered nationally per year in the first 2 years of the program — about 2.4 episodes of Guillain-Barré syndrome would be expected to occur within 6 weeks of vaccination. In addition, about 3.9 seizures and 6.5 acute allergy presentations would be expected to occur within 1 day of vaccination, including 0.3 episodes of anaphylaxis.

Clothier et al. on Human papillomavirus vaccine in boys: background rates of potential adverse events.

Wait. Are they saying that the HPV vaccine is going to cause Guillain-Barré syndrome, seizures, allergic reactions, and anaplylaxis?

Of course not. When the study was done, the kids hadn’t gotten any vaccines yet!

That was the background rate of those conditions.

They happened before the vaccine was given, and you can expect them to continue to happen after these kids start getting vaccinated – at that same rate.

What if they start happening more often after kids get vaccinated?

Then it makes it less likely to be a coincidence and more likely that the vaccine is actually causing an increase in the background rate. And vaccine safety studies look for that, which is how we know that vaccines don’t cause SIDS, transverse myelitis, multiple sclerosis, and many other conditions.

Most of you will have heard the maxim “correlation does not imply causation.” Just because two variables have a statistical relationship with each other does not mean that one is responsible for the other. For instance, ice cream sales and forest fires are correlated because both occur more often in the summer heat. But there is no causation; you don’t light a patch of the Montana brush on fire when you buy a pint of Haagan-Dazs.

Nate Silver on The Signal and the Noise

Of course, when we are talking about coincidences, we are also talking about correlation and causation.

When correlation doesn’t equal causation, then it’s probably a coincidence. Or it’s at least caused by some other factor.

And coincidences happen all of the time.

Is It a Vaccine Injury or a Coincidence?

That something could be a coincidence is not typically want parents want to hear though, especially if their child has gotten sick.

What does it mean that something happens coincidentally?

“Most sudden cardiac deaths that remain unexplained after necropsy are probably caused by primary cardiac arrhythmias.”

Sudden death in children and adolescents

Often it just means that it is unexplained. And that it is chance alone that it occurred as the same time as something else.

“In the absence of a specific etiology for ASDs, and a tendency among parents of children with a disability to feel a strong sense of guilt, it is not surprising that parents attempt to form their own explanations for the disorder in order to cope with the diagnosis.”

Mercer et al on Parental perspectives on the causes of an autism spectrum disorder in their children

Again, when folks blame vaccines, it is often because they have nothing else to blame.

“In some fraction of the American population, however, the belief in a link remains. One reason is a coincidence of timing: children are routinely vaccinated just as parents begin to observe signs of autism. Most vaccines are administered during the first years of life, which is also a period of rapid developmental changes. Many developmental conditions, including autism, don’t become apparent until a child misses a milestone or loses an early skill, a change that in some cases can’t help but be coincident with a recent vaccination.”

Emily Willingham on The Autism-Vaccine Myth

Think that it is too big of a coincidence that some infants develop spasms shortly after their four month vaccines?

Dr. William James West first described these types of infantile spasms in the 1840s!

And the “Fifth Day Fits,” seizures that began when a newborn was five days old, was described in the 1970s, well before we began giving newborns the hepatitis B vaccine.

But SIDS was only discovered after we began vaccinating kids, right?

“But, with millions upon millions of doses given each year to infants in the first 6 months of life across industrialized countries and with sudden infant death syndrome being the most common cause of infant death among infants 1 month or older, the coincidence of SIDS following DTP vaccination just by chance will be relatively frequent. When the two events occur, with SIDS following vaccination, well-meaning and intelligent people will blame the vaccine. They seek order out of randomly occurring events.”

Jacobson et al. on A taxonomy of reasoning flaws in the anti-vaccine movement

Of course not.

Cases of SIDS have been described throughout recorded history and have been well studied to prove that they are not associated with vaccines.

“Some events after immunisation are clearly caused by the vaccine (for example, a sore arm at the injection site). However, others may happen by coincidence around the time of vaccination. It can therefore be difficult to separate those which are clearly caused by a vaccine and those that were going to happen anyway… Scientific method is then used to determine if these events are a coincidence or a result of the vaccine.

Vaccine side effects and adverse reactions

It is easy to blame a vaccine when something happens and a child was recently vaccinated. That is especially true now that anti-vaccine folks turn every story of a child’s death or disability into a vaccine injury story.

“Autism was known well before MMR vaccine became available.”

Chen et al. on Vaccine adverse events: causal or coincidental?

Blaming vaccines when it is clear that vaccines aren’t the cause doesn’t help anyone though. It scares other parents away from vaccinating and protecting their kids. And it doesn’t help parents who need support caring for a sick child or help coping with the loss of a child.

What to Know About Vaccine Injuries vs Coincidences

While all possible adverse events after getting a vaccine should be reported to VAERS and your pediatrician, remember that just because something happened after getting vaccinated, it doesn’t mean that it was caused by the vaccine.

More on Vaccine Injuries vs Coincidences

Can I Give My Kids Tylenol When They Have Their Vaccines?

Many parents ask about acetaminophen (Tylenol) when kids get their vaccines.

Is it okay to give kids Tylenol when they get their shots?

The Tylenol and Vaccines Controversy

As you can probably guess, there is no real controversy about Tylenol and vaccines.

Instead, what we are talking about are the myths surrounding Tylenol and vaccines that anti-vaccine folks have created, including that:

  • giving Tylenol right before a child gets their shots somehow increases the risk that they will have side effects
  • giving Tylenol right after a child gets their shots somehow masks the symptoms of serious vaccine damage
  • giving Tylenol after the MMR vaccine is associated with developing autism

Fortunately, most parents understand that like other anti-vaccine misinformation, none of these statements are true.

Why do some folks believe it?

Well, there have been studies warning people about giving Tylenol before vaccines. It had nothing to do with side effects though. They suggested that a vaccine might be less effective if the child got Tylenol before his vaccines. It is important to note that they never really found that the vaccines didn’t work as well, as all of the kids in the study still had protective levels of antibodies, they were just a little lower than kids who didn’t get Tylenol.

Other studies have found the same effect if Tylenol was given after a child got his vaccines. Although interestingly, other studies have found that giving Tylenol after vaccines does not affect antibody titers.

“Antibody titres to diphtheria and tetanus toxoids and pertussis bacteria of the placebo (n = 25) and acetaminophen (n = 34) groups did not differ significantly from each other. It is concluded that acetaminophen in a single dose schedule is ineffective in decreasing post-vaccination fever and other symptoms.”

Uhari et al on Effect of prophylactic acetaminophen administration on reaction to DTP vaccination

Giving Tylenol after the MMR vaccine is not associated with autism.
Giving Tylenol after the MMR vaccine is not associated with autism.

The only thing that this had to do with side effects though, is that the kids who got Tylenol had a little less fever.

Could giving Tylenol mask something like encephalitis, which some anti-vaccine folks think can be vaccine induced?

Nope. It typically can’t even keep someone from getting a febrile seizure.

What about the association of MMR, Tylenol and autism? Although one study did suggest that to be true, the study, a parental survey, was found to be “fatally flawed.”

Can I Give My Kids Tylenol When They Have Their Vaccines?

So, can you give your kids Tylenol when they get their vaccines?

The better question is, should you give your kids Tylenol either before or after they get their vaccines?

Have some Tylenol or Motrin on hand after your kids get their vaccinations, just in case they need a dose.
Have some Tylenol or Motrin on hand after your kids get their vaccinations, just in case they need a dose. Photo by Vincent Iannelli, MD

Notwithstanding the very small chance that giving Tylenol might cause decreased immunogenicity (lower antibody production) if you give it before your kids get their vaccines, since there is a good chance that they won’t have any pain or fever and won’t even need any Tylenol, then why give it?

Skip the “just in case” dose and wait and see if they even need it.

What about afterwards?

If your kids have pain or fever and are uncomfortable, then you should likely give them something for pain or fever control, such as an age appropriate dose of either acetaminophen or ibuprofen. Will that cause lower antibody production? Maybe. Will that mean that their vaccines won’t work. That’s doubtful. It certainly won’t lead to increased side effects though, unless they a reaction to the dose of Tylenol itself.

Should you give a pain or fever reducer after a vaccine “just in case?” Again, there is a good chance that your kids might not need it, so it is likely better to wait and see if they do, instead of giving a dose automatically after their shots.

There is even some evidence that giving acetaminophen or ibuprofen before vaccines, or as a routine dose right after, especially with booster shots, doesn’t really prevent side effects that well anyway. They work better if given on an as needed basis instead, and these kinds of doses are less likely to be associated with decreased antibody production.

What to Know About Tylenol and Vaccines

Giving a pain or fever reducer either before or after your child’s vaccinations likely won’t affect how it works, but since it often isn’t necessary, it is likely best to only given one, like Tylenol or Motrin, if it is really needed.

More on Tylenol and Vaccines

Can Vaccines Cause ITP?

ITP is an abbreviation for idiopathic thrombocytopenic purpura.

It is a condition in which our platelets get destroyed, leading to excessive bruising and bleeding, since platelets are needed for normal blood clotting.

What Causes ITP?

To understand what causes ITP, it is important to know it is also often referred to as immune thrombocytopenic purpura, because it is typically the cells of our own immune system that destroys our platelets.

Why?

Well, that’s where the idiopathic part comes in.

We don’t know why people develop ITP, although classically, ITP is thought to follow a viral infection, including Epstein-Barr virus (mono), influenza, measles, mumps, rubella, and varicella (chicken pox). ITP has also been associated with many other viral infections, from Dengue fever to Zika.

“Often, the child may have had a virus or viral infection approximately three weeks before developing ITP. It is believed that the body’s immune system, when making antibodies to fight against a virus, “accidentally” also made an antibody that can stick to the platelet cells. The body recognizes any cells with antibodies as foreign cells and destroys them. Doctors think that in people who have ITP, platelets are being destroyed because they have antibodies.”

Pediatric Idiopathic Thrombocytopenia Purpura (ITP)

These children with ITP, usually under age 5 years, develop symptoms a few days to weeks after their viral infections. Fortunately, their platelet counts usually return to normal, even without treatment, within about 2 weeks to 6 months. Treatments are available if a child’s platelet count gets too low though.

Can Vaccines Cause ITP?

The measles vaccine is the only vaccine that has been clearly associated with ITP.

“The available data clearly indicate that ITP is very rare and the only vaccine for which there is a demonstrated cause-effect relationship is the measles, mumps and rubella (MMR) vaccine that can occur in 1 to 3 children every 100,000 vaccine doses.”

Cecinati on Vaccine administration and the development of immune thrombocytopenic purpura in children

Even then though, the risk of ITP after a measles containing vaccine, like MMR or ProQuad, is much less than after getting a natural measles infection, so worry about ITP is a not a good reason to skip or delay getting vaccinated.

What about other vaccines?

There is no good evidence that other vaccines, including the chicken pox vaccine, DTaP, hepatitis B vaccine, or flu vaccine, etc., cause ITP.

What about Gardasil? ITP is listed in the package insert as an adverse reaction for Gardasil, but only in the postmarketing experience section, so it does not mean that the vaccine actually caused the reaction, just that someone reported it.

Although ITP is listed in the PI for Gardasil, studies have shown that there is no association.
Although ITP is listed in the PI for Gardasil, studies have shown that there is no association.

Several large studies have actually been done that found no increased risk for ITP after getting vaccinated with Gardasil.

What to Know About Vaccines and ITP

Although measles containing vaccines can rarely cause ITP, vaccines prevent many more diseases that can cause ITP.

More on Vaccines and ITP