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Measure content performance. Develop and improve products. List of Partners vendors. A preservative-free flu shot is a type of flu vaccine that does not contain the antiseptic and antifungal agent known as thimerosal.
The mercury-based compound is added to some vaccines to prevent the growth of bacteria, fungus, or other microorganisms that might contaminate a vial when a needle is inserted. Some people seek out preservative-free shot because they have heard that vaccine preservatives may cause autism , a claim that studies have repeatedly shown has no relationship whatsoever to any vaccine or vaccine ingredient.
This include thimerosal. The side effects of flu shots containing thimerosal are ultimately the same as those that are preservative-free. Thimerosal is used in multi-dose vials of the flu shot for delivery to multiple people. This helps ensure the purity of the vaccine from one person to the next.
Prior to the introduction of thimerosal, there were cases where a multi-dose vial was contaminated with bacteria between uses, leading to illness and even death. Preservatives became a requirement for multi-dose vaccines in , although they were in use well before then. Despite the proven safety of thimerosal in multi-dose vaccines, there were many who remained unconvinced. In , the safety of vaccines was cast into further doubt when a group of scientists in Great Britain published a study suggesting that the measles, mumps, and rubella MMR vaccine caused children to develop autism.
Although the study was published in one of the leading medical journals, The Lancet, it soon drew the ire of scientists who noted numerous flaws in the study model.
By , The Lancet issued a full retraction of the article and its findings. Nevertheless, the study set off a firestorm of misperceptions that led many parents to abandon vaccines, as well as the preservatives perceived to be harmful, altogether. As a result of the "public's perception of risk" of thimerosal, as described by the World Health Organization WHO , thimerosal was discontinued for use in most multi-dose vaccines in However, thimerosal is still used in some flu vaccines.
Yearly flu vaccines are recommended for all children. If you are worried about thimerosal, you can ask for a flu vaccine without it. Research does not show any link between thimerosal and autism. Read more about vaccines and autism.
All vaccine packages come with information called an insert that lists the ingredients. Check out this complete list of vaccines to see which ones contain thimerosal external icon.
Please see Thimerosal Publications for a list of scientific articles on thimerosal. Skip directly to site content Skip directly to page options Skip directly to A-Z link. Vaccine Safety. Section Navigation.
There are some side effects of thimerosal in vaccines. Scientific research does not show a connection between thimerosal and autism. Thimerosal was taken out of childhood vaccines in the United States in Related Links. Get Email Updates. To receive email updates about this page, enter your email address: Email Address. What's this? Links with this icon indicate that you are leaving the CDC website. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link. CDC is not responsible for Section compliance accessibility on other federal or private website. Cancel Continue. Formaldehyde Why is it used? Formaldehyde has been used for decades in vaccines to inactivate viruses and detoxify bacterial toxins, ensuring they don't result in sickness when injected.
The U. Additionally, several studies have since linked strong, long-term formaldehyde exposure to certain types of cancer. The potential for harm depends on the amount. Formaldehyde is always present in the human body as part of our natural metabolic process, but long-term exposure to high amounts can overwhelm our system and be harmful. Fortunately, the amount of formaldehyde found in vaccines is very small, most of it being diluted down to residual amounts during the manufacturing process.
In fact, the FDA reports there is 50 to 70 times more formaldehyde present in an average newborn's body than in a single dose of vaccine. In brief, current science shows formaldehyde in vaccines to be harmless.
The highest amount of formaldehyde present in any vaccine is. An average two-month-old baby would have around 1. Aluminum Why is it used? Aluminum is used as an adjuvant in vaccines. That is, it makes them more effective by strengthening the immune system response. Thanks to adjuvants, people need fewer doses of vaccine to build immunity. Sometimes the mention of aluminum in vaccines makes parents uneasy; that's because there has been some evidence that long-term exposure to high amounts of aluminum can contribute to brain and bone disease.
However, aluminum is naturally present in water, foods, even breast milk.
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