Myths About Thimerosal in Vaccines

Over the years, especially since thimerosal was removed from most vaccines, the myths about thimerosal have surprising been increasing.

“Currently, the actions taken by the vaccine manufacturers, the FDA and the CDC have increased the possible maximum childhood exposure to mercury from vaccines to twice the level that triggered the 1999 call to remove mercury from all vaccines as soon as possible!”

Rev. Lisa K. Sykes on “Ten Lies” Told About Mercury in Vaccines

Of course, none of them are true.

Myths About Thimerosal in Vaccines

To begin with, there was no “call to remove mercury from all vaccines as soon as possible.”

Instead, as a “precautionary measure,” the AAP asked vaccine manufacturers “for a clear commitment and a plan to eliminate or reduce as expeditiously as possible the mercury content of their vaccines.”

“In addition, today most tetanus shots and the multi-dose Sanofi Menomune vaccine that are approved by the US Food and Drug Administration (FDA) still contain 25-micrograms-a-dose mercury.”

Rev. Lisa K. Sykes on “Ten Lies” Told About Mercury in Vaccines

Other myths about thimerosal include that:

• After “realizing” the amount of mercury in the childhood vaccination schedule recommended by the CDC exceeded all national and global maximum safety limits, the American Academy of Pediatrics and the United States Public Health Service called for the immediate removal of Thimerosal from all vaccines on July 7, 1999. – the amount of thimerosal in the childhood immunization schedule actually only exceeded EPA guidelines and was well below the guidelines of the Agency for Toxic Substances Disease Registry (ATSDR) or the FDA. Also, since thimerosal-free versions of DTaP and Hib have always been available, only “a minority of infants could receive as much as 187.5 mcg of ethylmercury during the first 6 months of life.”
• children are getting even more mercury from vaccines today than when mercury was removed from vaccines, because pregnant women and kids get flu shots now – this theory doesn’t take into account that thimerosal-free flu vaccines have been available since 2003 and until recently, many kids didn’t get flu shots. For example, during the 2008-09 flu season, only 25% infants and toddlers were fully vaccinated against flu and even fewer pregnant women got flu shots (about 15%). The only way this myth could possibly be true would be if these folks all got a flu vaccine with thimerosal each and every year.
• even as thimerosal was removed from the DTaP, Hib, and hepatitis B vaccines, kids still got exposed to thimerosal from other vaccines, like Menomume, the meningococcal vaccine –  Although Menomume contained thimerosal, it had only been recommended for high risk kids since it was approved in 1981. It was later replaced by Menactra and Menveo, both of which are thimerosal-free, and which were recommended to all kids as they provided better coverage. Menomume was discontinued in 2017 and it is unlikely that many kids got it once Menactra and Menveo became available.
• kids still get a tetanus shot with thimerosal – yes, they did, at least until the Tdap vaccines were approved in 2006. Tdap is thimerosal-free.
• Thimerosal has never undergone even one modern safety test. – although mercury can be toxic, the thimerosal in vaccines has been shown to be safe. That’s not surprising – remember, “the dose makes the poison.”
• Published studies have shown that Thimerosal and its mercury breakdown product contribute to: Alzheimer’s, Cancer, Autism Spectrum Disorders, Attention Deficit Disorders, Bipolar Disorder, Asthma, Sudden Infant Death Syndrome, Arthritis, Food Allergies, Premature Puberty, and Infertility. – thimerosal in vaccines doesn’t cause any of these things, but you can probably find a published study somewhere saying that thimerosal causes Alzheimer’s, cancer, or food allergies, etc., but that just points to how important it is to look to trusted sources of information, as almost anyone can publish a bad study
• Contrary to sound bites you hear on the nightly news, to be “anti-mercury” is not to be “anti-vaccine.” – if this is true, then why did Robert F. Kennedy, Jr write an editorial against University of Colorado students who passed a resolution for meningococcal B vaccines, which are thimerosal-free? And why push so much propaganda about thimerosal?
• Corresponding to the sharply increasing level of mercury in the immunization schedule globally, which started in the late 1980’s, there has been an increasing rate of autism among children. This also explains why autism among 40-, 50-, 60-, 70- and 80-year-olds is not epidemic, but rather rare. – this is one of the main problems of the anti-vaccine movement… if you believe that autism is an epidemic, then there must be a cause and it becomes easy to blame vaccines. You also have to ignore the fact that there are plenty of autistic adults.
• Among the Amish who do not vaccinate, the rate of autism is strikingly low. – there are autistic Amish
• Unused vaccines with a preservative level of Thimerosal, however, are considered hazardous waste because of their high mercury content. If not injected into patients, discarded vials of these mercury-preserved vaccines, therefore, must be disposed of in steel drums, by law. – this is not true – at all… you also don’t have to call a Hazmat team if you break an unused vaccine vial with thimerosal…
• …instead of requiring immediate removal, the CDC allowed the pharmaceutical companies to save money by using up their inventories of mercury-containing vaccines. By 2003, the industry had finally used up stocks of thimerosal-containing vaccines and Thimerosal is no longer used in these three vaccines. – the only basis for this statement is that the last thimerosal containing DTaP, Hib, and hepatitis B vaccines expired in 2003, but it is important to keep in mind that most vaccines are used well before their expiration date. In fact, many doctors order vaccines every month, so as to not keep large supplies of vaccines in their office, and since thimerosal-free versions were already available, those likely would have been ordered.
• The term “trace amounts” means less than 1 microgram (mcg). Thimerosal-containing flu shots contain what in biochemical terms is actually a massive dose of mercury: 25 mcg. – vaccines labeled as having a trace amount of thimerosal have less than or equal to 1mcg, while others are clearly labeled as having up to 25mcg.
• Why do I call that massive? Because the Environmental Protection Agency’s maximum exposure limits for methyl mercury is .1 microgram per 1 kilogram of bodyweight, which means a baby would have to weigh 550 pounds to safely absorb 25 micrograms of mercury. At these levels, a growing fetus in a mother receiving the flu shot could get up to a million times the EPA’s safe levels. – wait, what? First, that is the maximum recommended daily exposure limit based on the assumption that the exposure to mercury will continue for long periods of time. That’s not the case when a pregnant woman gets a one time flu shot. And it is the pregnant mother who is getting the flu shot, not the baby. Although some thimerosal will cross the placenta, it is still not in levels that will cause harm, so calling the dose massive ends up just being an obvious propaganda tool to scare folks.

• Autism and mercury poisoning have the same symptoms. – they don’t… In fact, there are many reports of epidemics of mercury poisoning throughout history that weren’t associated with autism, including in Minamata and Niigata, Japan, exposures from mercury in teething powders and worm medicines (pink disease), and food contamination in many countries.

“Yet mercury had long been the every-day treatment of infants at the time of teething in the form of teething powders.”

Ann Dally on The Rise and Fall of Pink Disease

Although it is hard to believe now, mercury wasn’t taken out of teething powders until 1957, after which time pink disease quickly disappeared. Why was mercury in teething powders in the first place? Unlike thimerosal in vaccines, I don’t think it was acting as a preservative, as it sounds like it was present in very high doses. So there was a lot of risk with no benefit.

Sounds like the opposite of what we had with thimerosal in vaccines – lots of benefit (vaccines didn’t get contaminated) with no risk.

But taking thimerosal out of vaccines was risk-free too, wasn’t it?

Nope. That’s another myth.

“Unfortunately, the precautions taken by the AAP and CDC calling for thimerosal removal from vaccines appears to have led to unintended risks. In particular, inappropriate recommendations by autism advocacy groups regarding treatment of autism (e.g., use of chelation) and avoidance of vaccines (e.g., influenza vaccine) may mislead parents to place children at unnecessary risks.”

Hurley et al on Thimerosal-Containing Vaccines and Autism: A Review of Recent Epidemiologic Studies

In addition to anti-vaccine folks continuing to push myths about thimerosal to scare parents away from vaccinating and protecting their kids, some missed out on getting vaccinated and caught life-threatening vaccine-preventable diseases.

What to Know About Thimerosal in Vaccines Myths

Don’t believe any of the myths about thimerosal in vaccines. Vaccines are safe and necessary.

More on Thimerosal in Vaccines Myths

• WHO – Statement on thiomersal
• CDC – Understanding Thimerosal, Mercury, and Vaccine Safety
• CDC – Studies on Thimerosal in Vaccines
• AAP – Vaccine Safety : Examine the Evidence
• Why Thimerosal is Safe
• Thimerosal-Containing Vaccines and Autism: A Review of Recent Epidemiologic Studies
• Thimerosal and Autism?
• Mercury, Vaccines, and Autism
• Toxic myths about vaccines
• Thimerosal
• Thimerosal in Vaccines
• Antivaxxers Still Flogging Thimerosal
• Thimerosal in vaccines did not cause an autism epidemic
• No, the thimerosal in the flu vaccine does not explain why autism rates did not go down
• Common Immunization Myths and Misconceptions
• Journal Club Debunks Anti-Vaccine Myths
• Mercury in vaccines as a cause of autism and autism spectrum disorders (ASDs): A failed hypothesis
• I’m Mad, Part One: Mercury/Thimerosal
• Flu vaccine ingredients – not so scary using simple math
• Exposure to mercury does not cause autism–another myth debunked
• What Is Thimerosal and Why Are Some People Worried About it?
• 15 Common Anti-Vaccine Arguments and Why They are a Load of Crap
• 100 bad arguments against vaccines
• What? Removing thimerosal from vaccines caused the autism epidemic?
• The Rise and Fall of Pink Disease