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The primary purpose of administering a vaccine is to stimulate the immune system to develop protection against specific infectious diseases. Vaccines work by introducing a harmless component or a weakened form of a pathogen into the body, prompting the immune system to recognize it as a threat. This process leads to the development of an immune response, including the production of antibodies, which prepares the body to fight off the actual infection if it occurs in the future.

Vaccinating individuals helps to build herd immunity in populations, reducing the spread of infectious diseases and ultimately protecting vulnerable individuals who may be unable to receive vaccinations due to health conditions. This preventive approach is essential for controlling outbreaks and has led to the eradication or significant reduction of several infectious diseases.

In contrast, the options that suggest curing existing diseases or reducing symptoms do not align with the primary function of vaccines, as they do not treat infections; rather, they help prevent them from occurring in the first place. Vaccines complement other medical treatments but do not replace them; they serve a unique role in disease prevention.