A nurse is preparing to administer the first measles, mumps, and rubella (MMR) immunization to a 15-month-old toddler. Which of the following findings is a contraindication for this immunization?

Rationale: A. Taking antibiotics for otitis media is not a contraindication; mild infections do not prevent vaccination. B. A mild fever (100.2°F) or mild illness may warrant a short delay, but it is not a strict contraindication for MMR. C. Immunodeficiency is a contraindication for live vaccines such as MMR because the weakened virus could cause severe infection in an immunocompromised child. D. A previous mild fever after immunizations is not a contraindication for subsequent doses; past mild reactions do not preclude future vaccination.