... the production of antibodies. For example, if u have had measles before then your body will have produced antibodies as a result of the initial infection and these will help the leukocytes fight off any next measles infection. This implies that if u had measles before, you wouldn't catch it again because of the presence of the antibodies in your body produced when u had measles. However, if u haven't had measles before, you can get vaccinated to prevent you from having it in the future. Vaccination is when you are injected with a mild dose of disease so that your body can produce antibodies. There are several kinds of white blood cells within the immune system such as T cells which destroys invaders, T-helper cells which increases immunological activity, B cells and natural killer cells which are involved in the fight against both viruses and tumours. * Kiecolt - Glaser et ...

See this essay or coursework document in full right now