Difficulty: Medium
Average Score: 83%
Simulated
A nurse is collecting data from a client before administering a hepatitis B immunization. The nurse should withhold the immunization if the client is allergic to which of the following substances?
Correct answer
A
Rationale
The correct answer is A: Baker's yeast. Hepatitis B vaccines are produced using baker's yeast, specifically Saccharomyces cerevisiae. If a client is allergic to baker's yeast, there is a risk of an allergic reaction to the vaccine. Nuts (B), wheat (C), and egg yolk (D) are not ingredients used in the hepatitis B vaccine production, so allergies to these substances would not necessitate withholding the immunization.