Yeast allergy
Residual of yeast can be found in HBV and HPV vaccines produced by cell cultures of Saccharomyces Cerevisiae . Allergy to yeast is very rare, especially in young individuals, and in case of allergy suspicion such patients need to undergo allergy workup: I) skin prick test with yeast extract; II) specific IgE to yeast. In case of positive results vaccination with fractionated doses is necessary.