Immunology is the branch of medicine covering diagnosis and treatments of the immune system in humans. It is also found in sapient species, plants and animals. But, there is a huge difference between comparative immunology and human immunology.
Immunologist is also called an allergist! They are doctors specialized in diagnosing, treating and managing allergies, asthma and immunologic disorders like primary immunodeficiency disorders.
Vaccines are sometimes important for immunization. It improves the immune system enabling your body to combat certain diseases and infections. Immunizations help in fighting against infected agents.
Visit and consult an Immunologist or an Allergist if you are suffering from any immunological issues!