Thank you for your question.
Vaccines stimulate the immune system to be able to fight off various infections.
If a person has HIV and still has a fully functioning immune system, that vaccine should still work well. Therefore if a person has HIV, immunizations such as the Hepatitis B vaccine may still be helpful. But again, the more damaged the immune system is, the less effective a vaccine may be. However, if a person were to receive a live vaccine, this may prove more harm than good. The physician must then determine if that vaccine would be safe to give, and how effective it may be.