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Thiomersal is very toxic by inhalation, ingestion, and in contact with skin (EC hazard symbol T+), with a danger of cumulative effects. It is also very toxic to aquatic organisms and may cause long-term adverse effects in aquatic environments (EC hazard symbol N). [24]
Concerns about thiomersal and vaccines are commonly expressed by anti-vaccine activists. Claims relating to the safety of thiomersal, a mercury-based preservative used in vaccines, are refuted, but still subject to fearmongering, notably claims it could cause neurological disorders such as autism, leading to its removal from most vaccines in the US childhood schedule. [1]
The toxicity of organomercury compounds [1] [2] presents both dangers and benefits. Dimethylmercury in particular is notoriously toxic, but found use as an antifungal agent and insecticide. Merbromin and phenylmercuric borate are used as topical antiseptics, while thimerosal is safely used as a preservative for vaccines and antitoxins. [3]
Mercury poisoning is a type of metal poisoning due to exposure to mercury. [3] Symptoms depend upon the type, dose, method, and duration of exposure. [3] [4] They may include muscle weakness, poor coordination, numbness in the hands and feet, skin rashes, anxiety, memory problems, trouble speaking, trouble hearing, or trouble seeing. [1]
It’s a safe, effective treatment for metal toxicity, Roach says, but, “It needs to be prescribed by an expert and used in a carefully monitored situation.” ... Some claim thimerosal—a ...
The concentration of thiomersal used in vaccines as an antimicrobial agent ranges from 0.001% (1 part in 100,000) to 0.01% (1 part in 10,000). [69] A vaccine containing 0.01% thiomersal has 25 micrograms of mercury per 0.5 mL dose, roughly the same amount of elemental mercury found in a three-ounce (85 g) can of tuna . [ 69 ]
Thiomersal is a harmless component in vaccines which is used to maintain its sterility, and there are no known adverse effects due to it. [39] Aluminium is included in the vaccine as an adjuvant, and it has low toxicity even in large amounts. [38] Formaldehyde included in some vaccines is in negligibly low quantities and it is harmless. [38]
The Forest Service told NPR that this year, it phased out the use of one type of Phos-Chek formula - Phos-Chek LC95 - in favour of another - MVP-Fx - saying that the latter is less toxic to wildlife.