Some vaccines, certain foods like garlic and onions are good for the blood, vegetables, Fruit, a glass of red wine occasionally etc eating healthy and drinking water.
A vaccines helps because they put some of the disease in your body then your body can get use to it so if you get that disease your body can easily fight it out of you!
The hydrochloric acid in the stomach helps protect against disease because it kills many microorganisms and toxins in food.
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The fluid that carries different substances and cells that help regulate body functions and protect the body against disease and infections is called blood.
Antigens do not protect the body from disease. Antibodies protect the body from many diseases.
Vaginal Secretions techniquely do not protect the body from disease. For example, STD, women still get them. However it does protect the body from infections. The secretion is very acidic and kills most infections.
Immunity
Antibodies
If you knew what a disease was, you'd know that they are things that harm or kill people. Then you'd know why the body needs to protect against them.
Immune system protects the body from any type of foreign antigen or pathogen which can cause disease. It also protect from particles to cause disease in human body.
The immune system helps protect the body by removing bacteria and foreign bodies.
Active vaccination produces antibodies against the particular organism. These antibodies kill the invading pathogen and protect the body against the disease.