Sarah Bennett
Thimerosal, a mercury-based preservative, has been used in vaccines since the 1930s. It is nearly 50% mercury by weight and has been linked to mercury poisoning. Due to concerns about its safety, thimerosal has been removed from most children's vaccines in several countries, including the US. However, it is still present in some veterinary vaccines, including rabies vaccines. While there is limited research on the potential harmful effects of thimerosal in veterinary vaccines, pet owners are advised to request thimerosal-free alternatives from their veterinarians.
| Characteristics | Values |
|---|---|
| Mercury compound in rabies vaccine | Thimerosal, Thiomersal, Merthiolate |
| Other names for Thimerosal | Thiomersal, Merthiolate |
| Thimerosal introduction in vaccines | Eli Lilly in the 1930s |
| Thimerosal composition | Mercury-based preservative, nearly 50% mercury by weight |
| Thimerosal properties | Very inflammatory neurotoxin and genetic mutator |
| Thimerosal side effects | Over 50% of vaccinated dogs suffered inflammatory reactions |
| Thimerosal ban | Children's vaccines in Russia, Denmark, Great Britain, Austria, and Japan |
| Thimerosal-free rabies vaccines | IMRAB 3 TF, IMRAB 1 TF, RABVAC 3 TF |
| Thimerosal-free rabies vaccine manufacturer | Merial, Fort Dodge |
Explore related products
What You'll Learn
- Thimerosal is a mercury-based preservative used in rabies vaccines
- Thimerosal is nearly 50% mercury by weight
- The use of Thimerosal in vaccines has declined due to the development of single-dose presentations
- There are concerns about Thimerosal's link to autism and other health risks
- There are thimerosal-free rabies vaccines available
Thimerosal is a mercury-based preservative used in rabies vaccines
Thimerosal, also known as Thiomersal, is a mercury-based preservative used in biological and drug products, including many vaccines. It was first introduced in the 1930s and has been used extensively since then to prevent bacterial and fungal contamination of vaccines.
Thimerosal is composed of approximately 50% mercury by weight. It is an inflammatory neurotoxin and genetic mutator, and its safety has been questioned over the years. Pittman Moore Animal Pharmaceutical Company, for instance, warned Eli Lilly about its potential dangers as early as 1935. They found that over 50% of vaccinated dogs exhibited inflammatory reactions to Thimerosal. Despite this, Thimerosal continues to be used as a preservative in numerous vaccinations for both humans and animals.
The use of Thimerosal has declined in recent years due to the development of new products formulated into single-dose presentations that do not require preservatives. Additionally, concerns have been raised about the potential link between Thimerosal and autism due to the similarities between mercury poisoning and autism symptoms. As a result, Thimerosal has been eliminated from pediatric vaccines in several countries, including Russia, Denmark, Great Britain, Austria, and Japan, and its quantity has been reduced in other vaccines.
When vaccinating against rabies, it is important to check the label to ensure that the vaccine is Thimerosal-free if mercury is a concern. Some companies now offer canine rabies vaccines without Thimerosal, such as Merial's IMRAB 3 TF and RABVAC 3 TF by Fort Dodge.
Vaccine Accessibility for Australian Children
You may want to see also
Explore related products
$19.19 $14.95
Thimerosal is nearly 50% mercury by weight
Thimerosal, also known as Thiomersal, is a mercury-based preservative that is nearly 50% mercury by weight. It was first introduced in vaccines in the 1930s by Eli Lilly. It is a very inflammatory neurotoxin and genetic mutator, and despite safety concerns raised by Pittman Moore Animal Pharmaceutical Company, it is still used as a preservative in many human and dog vaccines.
Thimerosal has been the subject of controversy and scrutiny due to its potential link to autism and other neurodevelopmental disorders. Some countries, including Russia, Denmark, Great Britain, Austria, and Japan, have banned Thimerosal from children's vaccines. However, it is still used in the United States, particularly in inexpensive veterinary rabies vaccines and multi-dose vials to reduce manufacturing costs.
The safety of Thimerosal has been evaluated by various regulatory bodies, including the Global Advisory Committee on Vaccine Safety, the European Agency for the Evaluation of Medicinal Products, the American Academy of Pediatrics, and the U.S. Food and Drug Administration (FDA). These evaluations concluded that Thimerosal does not cause long-term toxic effects due to the short biological half-life of ethyl mercury, which is excreted from the body without accumulating.
Despite these evaluations, it is important for pet owners to be informed and proactive when it comes to their pets' health. When vaccinating dogs for rabies, it is recommended to check the vaccine label and request a Thimerosal-free option if available. Additionally, consulting with trusted veterinarians and seeking second opinions can help ensure the best decisions are made for the health and well-being of pets.
In summary, Thimerosal, a mercury-based preservative used in vaccines, is composed of nearly 50% mercury by weight. While its safety has been evaluated and it is still used in some vaccines, there are ongoing concerns about its potential link to neurodevelopmental disorders. Pet owners, in particular, are advised to be vigilant and opt for Thimerosal-free alternatives when possible.
MRNA Vaccines: Do They Stay in Bloodstream?
You may want to see also
Explore related products
The use of Thimerosal in vaccines has declined due to the development of single-dose presentations
Thimerosal, also known as Thiomersal, is a mercury-based preservative that has been used in vaccines since the 1930s. It was introduced to prevent the growth of harmful microbes in multi-dose vials, which are vials containing more than one dose of the vaccine. The use of Thimerosal has been a topic of debate due to concerns about potential health risks associated with mercury exposure.
Thimerosal is nearly 50% mercury by weight, and its use in vaccines has been linked to inflammatory reactions in dogs, with over 50% of vaccinated dogs exhibiting these reactions. Additionally, there have been concerns about a possible connection between Thimerosal and autism due to similarities in symptoms between mercury poisoning and autism. However, studies by the CDC and other organizations have failed to find evidence supporting a link between Thimerosal and autism.
Despite the lack of conclusive evidence of harm, precautionary measures have been taken to reduce or eliminate Thimerosal from vaccines. In 1999, the Public Health Service agencies, the American Academy of Pediatrics, and vaccine manufacturers agreed to reduce or eliminate Thimerosal from vaccines. This has led to the development and availability of thimerosal-free vaccines for children and adults in the United States.
The use of Thimerosal in vaccines has significantly declined due to the development of single-dose presentations. Single-dose vaccines do not require preservatives like Thimerosal, as there is less risk of contamination when a syringe needle enters a single-dose vial compared to a multi-dose vial. This shift towards single-dose presentations has resulted in a decrease in the use of Thimerosal as a preservative in U.S. FDA-licensed vaccines.
While the majority of rabies vaccines contain Thimerosal, there are thimerosal-free options available for both humans and dogs. It is important for individuals to do their research and consult with their healthcare providers or veterinarians to make informed decisions about vaccinations.
Hep B Vaccine: Improved Immunity or Marketing Ploy?
You may want to see also
Explore related products
![Thimerosal : Let the Science Speak: The Evidence Supporting the Immediate Removal of Mercury--A Known Neurotoxin--From Vaccines (Paperback - Revised Ed.)--by Robert F. Jr. Kennedy [2015 Edition]](https://m.media-amazon.com/images/I/51WVoyQChEL._AC_UY218_.jpg)
There are concerns about Thimerosal's link to autism and other health risks
Thimerosal, a mercury-based preservative, has been linked to autism and other health risks. It is approximately 50% mercury by weight and has been used in vaccines since the 1930s. While it is effective in preventing bacterial contamination, it is also a very inflammatory neurotoxin and genetic mutator. Pittman Moore Animal Pharmaceutical Company warned Eli Lilly Company about its safety concerns as early as 1935, noting that over 50% of vaccinated dogs exhibited inflammatory reactions.
Despite these warnings, Thimerosal continued to be used in vaccines, leading to concerns about its potential health risks. One of the main concerns is the possible link between Thimerosal and autism. This speculation arose due to the similarities between the symptoms of mercury poisoning and autism. While an Institutes of Medicine report failed to find conclusive evidence to support this link, the concerns prompted action from public health agencies and the American Academy of Pediatrics, who recommended the elimination of Thimerosal from pediatric vaccines.
Thimerosal has also been associated with other health risks. It has been linked to excessive inflammation, which can lead to vaccine-associated sarcomas. Additionally, it has been classified as a neurotoxin, raising concerns about its potential impact on the nervous system. Some countries, including Russia, Denmark, Great Britain, Austria, and Japan, have banned Thimerosal from children's vaccines due to these concerns.
While there is ongoing debate and conflicting evidence regarding the health risks associated with Thimerosal, some pharmaceutical companies have taken steps to address these concerns. For example, Merial has launched IMRAB3 TF, a thimerosal-free rabies vaccine for veterinary professionals. This product provides an alternative for those seeking to avoid Thimerosal in their vaccines.
It is important to note that the majority of studies on Thimerosal have focused on its impact on dogs, and there is a lack of clinical studies in veterinary patients. However, laboratory animal research suggests no significant health risks at the levels typically used in vaccines.
Hep A Vaccine: Can Local Health Departments Help?
You may want to see also
There are thimerosal-free rabies vaccines available
Thimerosal, also known as Thiomersal, is a mercury-based preservative that has been used in vaccines since the 1930s. It is approximately 50% mercury by weight and has been shown to be an inflammatory neurotoxin and genetic mutator. While it is effective in preventing bacterial contamination, concerns have been raised about its potential health risks, including mercury poisoning and possible links to autism.
In response to these concerns, some companies have started to produce thimerosal-free rabies vaccines. For example, Merial manufactures IMRAB 3 TF (TF stands for Thimerosal-Free), a thimerosal-free rabies vaccine for dogs, cats, and ferrets. Fort Dodge also produces a thimerosal-free rabies vaccine called RABVAC 3 TF. These vaccines are available in individual-dose packages, eliminating the need for preservatives like thimerosal.
It is worth noting that the use of thimerosal as a preservative in vaccines has been declining due to the development of single-dose presentations and alternative preservatives. The FDA has also taken steps to address the presence of mercury in vaccines, with a list of regulated products containing mercury compiled under the FDA Modernization Act of 1997.
When vaccinating your pet for rabies, it is important to do your research and consult with your veterinarian about the availability of thimerosal-free options. Some vets may prioritize profit over the health of your pet, so it is crucial to ask questions and seek a second opinion if necessary.
In summary, while the majority of rabies vaccines contain mercury in the form of thimerosal, there are indeed thimerosal-free alternatives available on the market. These vaccines provide a safer option for those concerned about the potential health risks associated with mercury exposure.
Hepatitis B Vaccination in Australia: What You Need to Know
You may want to see also
Frequently asked questions
Yes, the majority of rabies vaccines contain mercury in the form of Thimerosal, Thiomersal, or Merthiolate.
Thimerosal is a mercury-based preservative that has been used in vaccines since the 1930s to prevent bacterial and fungal contamination. It is effective in preventing bacterial contamination and facilitating immunization campaigns.
There have been concerns about the potential link between Thimerosal and autism or other developmental disorders due to its mercury content. However, subsequent research has failed to substantiate these claims. Additionally, a study on canine hair samples found no increase in mercury content associated with Thimerosal in vaccines.
Yes, some companies are now offering Thimerosal-free rabies vaccines, such as Merial's IMRAB 3 TF and RABVAC 3 TF by Fort Dodge. Ask your veterinarian about Thimerosal-free alternatives if you are concerned about mercury exposure.
