| http://www.w3.org/ns/prov#value | - Role of preservatives: Many vaccines need preservatives to prevent serious adverse effects such as Staphylococcus infection that, in one 1928 incident, killed 12 of 21 children inoculated with a diphtheria vaccine that lacked a preservative.[33] Several preservatives are available, including thiomersal, phenoxyethanol, and formaldehyde.
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