Active Immunization

Active immunization is conducted by injecting vaccine containing specific antigen into the body to bulid immune system. Antigen is a substance found in pathogen antigen which is recognized by the immune system as a foreign particles.

As a response to antigen, the immune system will develop antibody or T lymphocyte of white blood cell which is a special attacker cell. Some immunizations give complete protection against particular diseases for a life time.

Another type is by giving partial protection. It means the person given immunization only gets temporary immunity. Some other types of immunization require repetition injection periodically. For example tetanus injection which is suggested to be injected once in every 10 years of a life time.

Active immunization uses modified organism so that it will reduce the risk of causing disease. But it's still able to build a defense system to fight disease. Such as to protect the body from yellow fever, measles, chickenpox, and many other diseases caused by virus.