There’s A Newly Appointed Panel Of Experts At The U.S. Centers For Disease Control Adn Prevention (Cdc), Freshly Chosen By U.S. Health Secretary Robert F.Kennedy Jr. Called The Advisory Committee On Immunization practices, It sets The Immunization Schedule For Americans. And Some Of The New Members Have Histories Of vaccine-Skepticism.
On June 26,This Panel Voted To Remove Thimerosal From Flu Vaccines. The Ingredient Has Long Been The Target Of Anti-Vaccine Activists,Despite Numerous Studies Showing It’s Safe In Small Amounts.
The Committee’s Proposal Now Goes To The Cdc’s Acting Director To Become A Formal Recommendation. (Susan Monarez, President Trump’s Selection To Head The Agency, Is Currently Undergoing Confirmation Hearings).
Here’s How Thimerosal Got Into Vaccines, Why It’s Being Taken Out, And What The Latest Recommendation Could Mean For Next Season’s Flu Shots.
What Is Thimerosal?
Table of Contents
- 1. What Is Thimerosal?
- 2. Is Thimerosal Safe?
- 3. If Thimerosal Is Safe, Why Did Health Officials Remove It Once Before?
- 4. Here’s one PAA (People also Ask) related question,formatted as requested,based on the provided text:
- 5. Thimerosal in Vaccines: A Extensive Guide to Safety,Removal,and Understanding
- 6. What is Thimerosal? The Basics explained
- 7. The Role of Thimerosal
- 8. Thimerosal and Safety Concerns: Is Mercury Dangerous?
- 9. Ethylmercury vs.methylmercury
- 10. Studies and Research on Thimerosal Safety
- 11. the Removal of Thimerosal from Vaccines: A Timeline
- 12. Key Dates and Milestones in Thimerosal Removal
- 13. thimerosal in Vaccines: What Does “Thimerosal-Free” Mean?
- 14. Trace Amounts and Their Significance
- 15. Choice Preservatives in Vaccines
- 16. Common Alternative Preservatives
- 17. Vaccine Safety and Monitoring
- 18. The Vaccine Adverse Event Reporting System (VAERS)
- 19. Continuous Monitoring and Research
- 20. Frequently Asked Questions (FAQs) About Thimerosal
- 21. is Thimerosal Still Used in Any Vaccines Today?
- 22. Does Thimerosal Cause Autism?
- 23. Are Thimerosal-Free Vaccines Safer?
Thimerosal, Which Contains A Form Of Mercury Called Ethylmercury, Has Been Used In Vaccines As A Preservative Since The 1930s To Prevent Growth Of Fungi and Bacteria. At The Time, Most Vaccines Came In Larger Vials That Contained multiple Doses, And While The Vaccine Makers Produced A Sterile And Safe Product, “Each Time You Pierce A Needle [Into The Vial] You Are Perhaps introducing Contaminants That Can Lead To Infection,” Says Dr. Jason Goldman, President Of The American College Of Physicians. “While The Vaccine Itself Was Safe, The Vials Got Contaminated, And There Were Deaths From Infection. So The Decision Was Made To Put A Preservative In It.”
That Preservative-Thimerosal-Was Used Routinely In Vaccines Until 2001, When Federal Health Officials Decided To Remove It From The Majority Of Childhood Vaccines. It Is Currently Only Used In flu Vaccines That Come In Multi-Dose Vials.(Most Of The Flu Vaccines In The U.S. Come In Single-Dose Syringes That Do Not Contain Thimerosal.)
Is Thimerosal Safe?
Ethylmercury Is Cleared From The Body More Quickly Than Methylmercury, Which Is Primarily Found in Deep-Sea Fish Like Tuna. Both Types Of mercury Can Be Toxic To cells, Especially In The Brain, But The More Quickly-Cleared Ethylmercury Has Less Time To Cause Such Harm, According To The Cdc.
Read More: Fda Approves A Twice-Yearly Shot To Prevent Hiv
“Data From Many Studies Show No Evidence Of Harm Caused By The Low Doses Of Thimerosal In Vaccines,” The Cdc’s Website Says. That Includes Studies That Looked At A Variety Of Neurological And Psychological Outcomesas Well As Autism. Though, Researchers Say longer Term Data On The Health Effects Of Exposure To Both Types Of Mercury Isn’t Wholly Clear Yet.Consult your Doctor For Medical Advice.
If Thimerosal Is Safe, Why Did Health Officials Remove It Once Before?
in 2001, Federal Health Officials Decided To Remove Thimerosal From Most Childhood Vaccines, Which At The Time Included Shots For Influenza, Diphtheria, Tetanus, Pertussis, and hepatitis B. Thimerosal Remained In Trace Amounts In Larger Vials Of The Annual Flu Vaccine To Protect Against Contamination.
Dr. Paul Offit, A Member Of The Advisory Committee On Immunization Practices At The Time, Says There Were A Number Of Reasons For The Decision Back Then-Most of Which Had More To Do With Policy Pressures And Optics Than With concerns Over Health Harms. In Early 1998, Andrew Wakefielda Gastroenterologist In The U.K.,Had Published A Paper In Which He Linked The Mmr Vaccine For Measles,Mumps,And Rubella To An Increased Risk Of Autism. His Paper Has As Been Debunked And His Medical License Has been Revokedbut His Findings Sparked The anti-Vaccine Movement That Continues Today, Despite evidence That Vaccines Have Saved lives And Provide More Benefit Than Harm.
After Wakefield’s Paper Gained Notoriety, A U.S. Congressman Asked The Cdc’s Vaccine Experts To Review The Data And Vote Whether, As Wakefield Suggested, The Vaccines For The Three Diseases Shoudl Be Separated And Given Individually To Reduce Any potential Harm To Infants. It Wasn’t Based In Science, And “Around The Table We Voted ‘No,'” Says Offit, Who Was Part The Committee.
Read More: A Study retracted 15 Years Ago Continues To Threaten Childhood Vaccines
A Few Months Later, Vaccine Maker Wyeth Decided To Remove Rotashield, The First Vaccine To Protect Against Rotavirus, From The Market-Just 10 Months After It Was Approved. The Vaccine Was Linked to Rare bowel obstruction In Some Babies Who Had Received It In Their First Six Months.The Withdrawal Understandably Added To The Public’s Concerns About The Safety Of Vaccines.
So When Issues about The Potential Risks Of Mercury In Thimerosal Emerged, In Part Due To Wakefield’s Paper, Offit Says The Committee Was Faced with Addressing Americans’ Growing Concern That federal Health Agencies Were Not Adequately Ensuring Vaccine Safety. “We Had A Vaccine That Had Been Approved And Then Taken Off The Market; We Did Not Buy Andrew Wakefield’s Notion To Separate The Mmr Vaccine Into Three Component Parts. And Now We Had Thimerosal,” Says Offit. The Committee’s Leader, As Well As The members, “Were Cognizant Of The Fact That It Looked Like Were We Aren’t Paying Attention To Vaccine Safety, Or That We Didn’t care. Because We Approved Rotashield, And We Didn’t Listen To Andrew Wakefield.”
“My Understanding Was That At The Time, There Was Essentially No Evidence Of Any Harm From Thimerosal,” Says Dr. Sean O’Leary, Chair Of The Committee On infectious Diseases At The American Academy Of Pediatrics. “But The Concern was That It Probably Hasn’t Been Studied As Well As Perhaps We’d Like. And Since We Have The Technology To Remove It From The Childhood Vaccine Schedule, We Should Go Ahead And Do That. But Many, Many People Questioned That decision.”
What Are Your Thoughts On This decision? Share Your Comments And Help Us Keep The Conversation going.
Thimerosal in Vaccines: A Extensive Guide to Safety,Removal,and Understanding
Thimerosal,a mercury-containing preservative,has been a subject of intense scrutiny and discussion within the context of vaccines. This article explores the history, safety concerns, and removal of thimerosal from vaccines, providing a detailed overview for anyone seeking to understand this complex issue. We will also cover the most related topics to the subject, as well as the research that supports them.
What is Thimerosal? The Basics explained
Thimerosal (also known as thimerosal in the US space) is an organic mercury compound, specifically an ethylmercury derivative. Primarily, it functions as a preservative, its use designed to inhibit the growth of bacteria and fungi in multi-dose vaccine vials.The function is especially relevant in situations where the vaccine vials are opened multiple times for different patients, reducing the risk of contamination.
According to Wikipedia, Thimerosal is the sodium salt of an organomercury compound and is used as a preservative in cosmetic and pharmaceutical products to protect them from microbial spoilage.
The Role of Thimerosal
The primary function of thimerosal is to prevent the growth of possibly dangerous microorganisms within vaccines. Before its widespread use, multi-dose vials of vaccines posed a risk of contamination, leading to potential infections. The inclusion of thimerosal significantly lowered this risk, offering a safer way to distribute and administer vaccines.
- Preservative: Prevents bacterial and fungal growth.
- Prolongs Shelf Life: Extends the usability of vaccines.
- Safety: Reduces the risk of infections from contaminated vials.
Thimerosal and Safety Concerns: Is Mercury Dangerous?
The presence of mercury in thimerosal has fueled public concern and scientific investigation. The form of mercury in thimerosal is ethylmercury,which is different from methylmercury,a known neurotoxin. Though, the potential for adverse reactions, particularly in children, has led to widespread calls for its removal from vaccines.
Ethylmercury vs.methylmercury
It’s crucial to differentiate between ethylmercury and methylmercury.The latter is a more persistent form of mercury found in the surroundings. Ethylmercury, on the other hand, is metabolized and eliminated from the body more quickly.While this distinction is important, it doesn’t dismiss concerns about the potential for any harm associated with exposure.
Studies and Research on Thimerosal Safety
Extensive research has been carried out to evaluate the safety of thimerosal in vaccines.Governmental and independent studies have examined possible links with diseases like autism, but the overwhelming consensus is that there is no proven link between thimerosal and autism, however some scientists still continue to be very cautious.
Here’s a simplified overview of key study results (Note: This is a summary; consult primary sources for detailed information:):
| Study Area | Findings Summary |
|---|---|
| Autism Spectrum Disorder (ASD) | Most major studies have not established a causal relationship. Current research indicates no direct link. |
| Neurodevelopmental Effects | Some studies are still ongoing; the most recent research suggests that the levels found in vaccines are generally considered safe. |
| Overall Health Risks | Risk is considered low, but ongoing surveillance continues. |
the Removal of Thimerosal from Vaccines: A Timeline
Due to public concerns, most developed countries (including the USA) started removing thimerosal from childhood vaccines in the early 2000s. This was a precautionary measure to address the uncertainty without waiting for definitive proof of harm.
Key Dates and Milestones in Thimerosal Removal
- Early 2000s: Vaccine manufacturers began to reduce or eliminate thimerosal from most childhood vaccines in response to the initial safety concerns.
- 2001: The U.S. Public Health Service agencies, including the CDC and FDA, issued statements acknowledging the efforts and the widespread removal. This decision was guided by the precautionary principle.
- present Day: Today, most routine childhood vaccines available in the U.S. are thimerosal-free or contain trace amounts of the preservative.
thimerosal in Vaccines: What Does “Thimerosal-Free” Mean?
The term “thimerosal-free” can be somewhat nuanced. When applied to vaccines, it usually means the vaccine contains no more than trace amounts of thimerosal. Other vaccines, such as the influenza (flu) vaccines, can only have thimerosal or other preservatives in multi-dose vials.
Trace Amounts and Their Significance
The concern with vaccines containing trace amounts of thimerosal is minimal, given the current evidence and public health recommendations. The small amounts have been persistent, after numerous research, to be safe under the established guidelines.
Choice Preservatives in Vaccines
Where thimerosal has been removed, manufacturers use different approaches to ensure vaccine safety and effectiveness. These include alternative preservatives and improved manufacturing methods.
Common Alternative Preservatives
- 2-Phenoxyethanol: An alcohol ether used as a preservative.
- Formaldehyde: Used in small amounts to inactivate toxins.
- No preservatives in single-dose vials: Single-dose vials do not require preservatives, making them a common solution.
Vaccine Safety and Monitoring
Vaccine safety assessment is an ongoing process, with several systems in place to monitor any adverse health outcomes. A dedicated number of agencies perform routine surveillance and take prompt corrective measures.
The Vaccine Adverse Event Reporting System (VAERS)
VAERS is a national system co-managed by the CDC and the FDA. It collects reports of any adverse events after vaccination, allowing for early detection of potential safety concerns.
Continuous Monitoring and Research
Ongoing clinical trials and epidemiological studies help to refine vaccine safety even after vaccines are approved for use. This continuous process aims to reassure the benefits of vaccination.
Frequently Asked Questions (FAQs) About Thimerosal
is Thimerosal Still Used in Any Vaccines Today?
Yes, thimerosal is still present in some multi-dose influenza vaccines and some specific vaccines used internationally.
Does Thimerosal Cause Autism?
No, the scientific consensus, based on multiple large-scale studies, does not support a link between thimerosal in vaccines and autism.
Are Thimerosal-Free Vaccines Safer?
While “thimerosal-free” vaccines have been largely adopted to address public concerns,the evidence supports the safety of vaccines,with or without thimerosal. Continuous monitoring and public health recommendations affirm this.