A nurse is collecting a medication history from the parent of a preschooler who comes to the clinic for routine immunizations. For which of the following findings should the nurse withhold the varicella immunization?

A. A pregnant parent. A child can receive the varicella vaccine even if the parent is pregnant. While the varicella vaccine is a live attenuated vaccine, the vaccinated child does not pose a significant risk of transmission to others. The parent should avoid direct contact with the vaccinee's rash if one develops, but this is not a contraindication to immunization. B. Receiving treatment for leukemia. Children undergoing treatment for leukemia often have weakened immune systems due to chemotherapy or radiation. The varicella vaccine is a live attenuated vaccine, meaning it contains a weakened form of the virus that could cause severe illness in immunocompromised individuals. These children should not receive live vaccines until their immune function improves and their healthcare provider approves vaccination. C. Taking acetaminophen for mild discomfort. Acetaminophen is an over-the-counter pain reliever and fever reducer that does not interfere with the efficacy or safety of the varicella vaccine. There is no evidence that mild analgesic use before or after vaccination affects immune response, so it is not a reason to withhold the immunization. D. An allergy to eggs. Unlike some influenza and yellow fever vaccines, the varicella vaccine is not produced using egg-based components. An egg allergy is not a contraindication to receiving the varicella vaccine, as it does not contain egg proteins.