Preservatives Vaccines may also contain preservatives to prevent contamination with bacteria or fungi. Until recent years, the preservative thiomersal ( Thimerosal in the US and Japan) was used in many vaccines that did not contain live viruses. As of 2005, the only childhood vaccine in the U.S. that contains thiomersal in greater than trace amounts is the influenza vaccine, which is currently recommended only for children with certain risk factors.Wharton, Melinda E.; National Vaccine Advisory committee "U.S.A. national vaccine plan" Single-dose influenza vaccines supplied in the UK do not list thiomersal in the ingredients. Preservatives may be used at various stages of the production of vaccines, and the most sophisticated methods of measurement might detect traces of them in the finished product, as they may in the environment and population as a whole.
preservatives vaccines may also contain preservatives to prevent contamination with bacteria or fungi until recent years the preservative thiomersal ( thimerosal in the us and japan) was used in many vaccines that did not contain live viruses as of 2005 the only childhood vaccine in the us that contains thiomersal in greater than trace amounts is the influenza vaccine which is currently recommended only for children with certain risk factorswharton melinda e; national vaccine advisory committee "usa national vaccine plan" single-dose influenza vaccines supplied in the uk do not list thiomersal in the ingredients preservatives may be used at various stages of the production of vaccines and the most sophisticated methods of measurement might detect traces of them in the finished product as they may in the environment and population as a whole