A nurse is caring for a 2-month-old child. The child’s provider has ordered a diphtheria, tetanus, and pertussis (DTaP) vaccine to be administered. Which of the following should cause the nurse to question the administration of this vaccine?

Choice A reason: Afebrile otitis media is not a contraindication for DTaP vaccination, as mild infections without fever do not increase vaccine risks. DTaP is safe in stable children, and delaying vaccination could leave the infant vulnerable to pertussis, making this an incorrect reason to question administration. Choice B reason: A sibling’s new seizure disorder is not a contraindication for DTaP in the child, as seizures are not hereditary or vaccine-related in this context. DTaP is safe unless the child has a personal history of seizures post-vaccination, making this an incorrect reason to question administration. Choice C reason: Egg antigen sensitivity is relevant for vaccines like influenza, not DTaP, which is not egg-based. Allergic reactions to DTaP are rare and unrelated to eggs. This does not warrant questioning the vaccine, as it poses no increased risk, making this an incorrect concern. Choice D reason: A temperature of 40.5°C (104.9°F) after a prior DTaP suggests a severe reaction, a contraindication to further doses due to risk of recurrence or worsening. This high fever indicates potential hypersensitivity, requiring evaluation before administration to prevent adverse events, making it the reason to question the vaccine.