This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax firstname.lastname@example.org with numerous contributions by others.
Sensitivity to yeast or any other component of the vaccine. Pregnancy
is not a contraindication to hepatitis B vaccination. A previous
anaphylactic response to the vaccine is a contraindication to further
Vaccine components capable of causing adverse reactions: aluminum
phosphate, thimerosal, and formaldehyde (Travel Medicine
Advisor). (Note, though, that as of September 1999, a thimerosal free
hepatitis B vaccine is available.)