Immunoprophylaxis is defined as

• A. The prevention of disease by the administration of vaccines.
• B. The administration of medicines to treat a person.
• C. Place higher loads on the muscle, tendons, ligaments, and joints.
• D. Visual clues

Answer: (A)

Immunoprophylaxis means preventing disease by triggering the body's immune defenses before exposure. Vaccines do this by introducing harmless pieces of a pathogen or its inactivated form, teaching the immune system to recognize it. The immune system then develops memory cells and antibodies, so if the real pathogen appears later, the response is rapid and strong enough to prevent illness or lessen its severity. The other options describe treating disease after it occurs, increasing physical load on tissues, or something unrelated to immunity, so they don’t fit this concept.