Final answer:
The vaccine that is contraindicated for a child on long-term immunosuppressive therapy is the Hepatitis B vaccine.
Step-by-step explanation:
The nurse should know that the Hepatitis B vaccine is contraindicated for a child who has been receiving long-term immunosuppressive therapy. Immunosuppressive therapy can weaken the immune system, making it less effective at responding to vaccines. It is important to avoid giving live vaccines, such as the MMR vaccine, to individuals who are immunosuppressed because the live viruses in the vaccine pose a risk of causing the disease they are designed to prevent.