Immune System
In this way, the immune system is primed to recognize and defeat the micro-organism if the child encounters it at a later date. This method is also known as vaccination. Vaccination can give your child long-term protection from a range of infectious diseases that either cannot be treated or that spread so rapidly that treatment is inadequate. A different vaccine is given for each disease, because the immune system produces specific antibodies to kill each invader.
For most infections, several vaccinations are needed so that the immune system builds up and maintains a protective level of antibodies. Vaccination gives a significant level of protection against potentially fatal diseases. Many of these diseases still do not have an effective treatment, so vaccination may be the only way to protect your child. Immunization can also help to eradicate the virus or bacterium from circulation.