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* Division of Infectious Diseases, Childrens Hospital of Philadelphia, University of Pennsylvania School of Medicine, and Wistar Institute of Anatomy and Biology, Philadelphia, Pennsylvania
Department of Pharmacy, Childrens Hospital of Philadelphia, Philadelphia, Pennsylvania
Vaccines often contain preservatives, adjuvants, additives, or manufacturing residuals in addition to pathogen-specific immunogens. Some parents, alerted by stories in the news media or information contained on the World Wide Web, are concerned that some of the substances contained in vaccines might harm their children. We reviewed data on thimerosal, aluminum, gelatin, human serum albumin, formaldehyde, antibiotics, egg proteins, and yeast proteins. Both gelatin and egg proteins are contained in vaccines in quantities sufficient to induce rare instances of severe, immediate-type hypersensitivity reactions. However, quantities of mercury, aluminum, formaldehyde, human serum albumin, antibiotics, and yeast proteins in vaccines have not been found to be harmful in humans or experimental animals.
Key Words: vaccine safety thimerosal aluminum formaldehyde gelatin egg proteins yeast proteins
Abbreviations: FDA, Food and Drug Administration DTaP, diphtheria-tetanus-acellular pertussis Hib, Haemophilus influenzae type B EPA, Environmental Protection Agency ATSDR, Agency for Toxic Substances Disease Registry MMR, measles-mumps-rubella IgE, immunoglobulin E CJD, Creutzfeld-Jacob disease BSE, bovine spongiform encephalopathy vCJD, variant Creutzfeld-Jacob disease
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