What is the primary function of immunization?

The primary function of immunization is to make the body develop defenses against diseases. Immunization works by stimulating the immune system to recognize and fight specific pathogens, such as viruses and bacteria. When an individual receives a vaccine, the immune system responds by producing antibodies and activating immune cells that will be able to identify and neutralize the pathogen if the person is exposed to it in the future. This process helps to protect individuals and communities from infectious diseases, contributing to overall public health.

The other options do not accurately reflect the purpose of immunization. Introducing new viruses into the body is not only incorrect but counterproductive to the intended outcomes of vaccination, which is to prevent diseases rather than to introduce them. Enhancing digestion is unrelated to immunization, as immunization specifically targets the immune response rather than digestive functions. Reducing physical activity does not relate to the function of immunization, as vaccinations are designed for disease prevention and do not have an effect on physical activity levels.