Fact Check: "Thimerosal has been used in vaccines since before World War II."
What We Know
Thimerosal is a mercury-based preservative that has been used in vaccines and other medical products for decades. It was introduced in the 1930s and has been utilized in multi-dose vials to prevent contamination by bacteria and fungi (CDC). The use of thimerosal in vaccines predates World War II, aligning with the claim that it has been used since before that period.
Historically, thimerosal was incorporated into vaccines during a time when the medical community was looking for effective preservatives to combat bacterial contamination, especially before the advent of antibiotics (Baker). It was widely used in various vaccines until concerns about mercury exposure led to its removal from most childhood vaccines in the early 2000s (FDA).
Analysis
The claim that thimerosal has been used in vaccines since before World War II is supported by historical records indicating its introduction in the 1930s. The CDC confirms that thimerosal has been a component of vaccines for many years, specifically noting its use in multi-dose vials to prevent bacterial growth.
The reliability of the sources is high, as they include reputable organizations such as the CDC and the FDA, which have conducted extensive reviews and studies on vaccine safety. The historical context provided by Baker's article also adds depth to the understanding of thimerosal's introduction, emphasizing the medical practices of the time and the lack of awareness regarding mercury's potential risks at low doses (Baker).
While some anti-vaccination activists have propagated misinformation regarding thimerosal and its safety, the scientific consensus remains that the low doses used in vaccines do not pose a significant risk (CDC). The removal of thimerosal from most childhood vaccines was a precautionary measure rather than an acknowledgment of harm (FDA).
Conclusion
Verdict: True
The claim that thimerosal has been used in vaccines since before World War II is accurate. Historical records confirm that thimerosal was introduced in the 1930s, well before the onset of the war. The evidence from credible sources supports the assertion that thimerosal has a long history of use in vaccines, primarily as a preservative.
