Final answer:
At 12 months, key vaccines include Hib, DTaP, and MMR. A severe allergic reaction could be a contraindication to the MMR vaccine. It's crucial to get vaccinated to prevent severe diseases such as meningitis.
Step-by-step explanation:
The vaccines due at 12 months include Haemophilus influenzae type B (Hib), Diphtheria, tetanus, and acellular pertussis (DtaP), and Measles, mumps, rubella (MMR). A possible contraindication for one of these vaccines, specifically the MMR vaccine, is a severe allergic reaction to any component of the vaccine or a previous dose of it.
It's essential to visit your doctor to ensure timely vaccination, which helps prevent serious diseases. The Hib vaccine is particularly important as it prevents infections like meningitis caused by H. influenzae, a condition that could be severe in young children. Moreover, the conjugate form of the Hib vaccine is necessary as it helps the child's immune system develop a strong and lasting response to the bacteria, essential for long-term protection.