What is immunity?

• A. Illness caused by pathogens
• B. Ability to cure diseases quickly
• C. Ability to resist disease
• D. Process of vaccination

Answer: (C)

Immunity is the body's ability to resist disease, meaning its defenses can recognize and prevent pathogens from causing illness or reduce how severe an infection becomes. The immune system includes physical barriers like skin, plus immune cells and proteins that detect and attack invaders. There are two main strands: innate immunity, which acts quickly and generally against many threats, and adaptive immunity, which develops a targeted, specialized response after exposure and creates memory to respond even faster in the future. Vaccination helps build this adaptive immunity by safely exposing the immune system to a part of a pathogen, training it to respond effectively if real infection occurs. In animals, immunity can also be transferred from mother to offspring through colostrum, providing temporary protection. Immunity isn’t an illness, nor is it simply curing diseases quickly, and it’s not the vaccination itself—it's the organism’s overall ability to resist disease.