Final answer:
Children with sickle cell disease usually receive additional pneumococcal vaccines and the meningococcal vaccine at ages 2 and 5, and they should also get an annual flu vaccine due to their increased risk of infections.
Step-by-step explanation:
At age 2 and 5, children with sickle cell disease receive some additional vaccines that are important for their protection due to their increased risk of infections. Alongside routine vaccinations, they often receive pneumococcal vaccines to protect against pneumococcal infections, which can be particularly severe for these children. Moreover, they are also administered the meningococcal vaccine, which is recommended to protect against certain types of bacterial meningitis, a condition to which they are particularly susceptible. Additionally, an annual flu vaccine is also crucial for children with sickle cell disease to prevent influenza-related complications.