Vaccination :
It is possible to enhance the human body's immune system to resist pathogens that cause illness and diseases, not in a harmful manner, but through vaccination. Vaccines are made up of weakened or inactivated parts of a virus or bacteria so that it provokes the immune system to produce antibodies. This will allow a person to recognize and fight off those diseases, for example polio, measles, or flu if he or she gets infected later on. Vaccination represents probably the best approach to preventing infectious diseases which could rapidly progress and sometimes seriously worsen. Most vaccines have few side effects such as fever or soreness at the injection site, which are self-limiting. Vaccinations are not only important for children but also for adults particularly those where it is probable that they may come into contact with definite infectious agents or even medical conditions. Vaccination, then, strengthens the immune system of an individual and protects the latter against the causative agent of such an infectious disease while at the same time helping to curb its spread in the community. Regular vaccinations thus ensure long-term immunity while protecting public health.