Final answer:
The Measles, mumps, and rubella (MMR) vaccine is contraindicated for the immunocompromised 12-month-old infant because it contains live, attenuated viruses. Other vaccines like Hepatitis B and DTaP are not live vaccines and are typically safe for immunocompromised individuals.
Step-by-step explanation:
The immunization records of a 12-month-old immunocompromised infant should be reviewed carefully, as some vaccines are contraindicated for this client. In general, live vaccines are not recommended for immunocompromised individuals because they contain a small amount of the live virus, which could cause infection in a person with a weakened immune system. The Measles, mumps, and rubella (MMR) vaccine is a combination vaccine that provides protection against measles, mumps, and rubella, which are viral diseases. Since the MMR vaccine contains live, attenuated viruses, it is contraindicated for an immunocompromised child. The other vaccines listed, such as Hepatitis B and Diphtheria, tetanus, and acellular pertussis (DTaP), are not live vaccines and are generally safe for immunocompromised individuals, provided no other contraindications are present.