Activity immunity occurs as a result of?

Activity immunity occurs as a result of exposure to antigens. This type of immunity develops when the immune system encounters pathogens or their antigens, leading to an immune response. The body recognizes these foreign substances and produces specific antibodies and memory cells, which protect against future infections by the same pathogens. Through this natural process, individuals gain long-lasting immunity, as their immune system is primed to respond more effectively upon subsequent exposures to the same antigens.

While vaccination is also a form of activity immunity, it specifically entails the intentional introduction of antigens to stimulate an immune response without causing disease. Genetic inheritance refers to immunity passed down through genes, and mother's antibodies offer passive immunity, which is temporary and does not involve the individual's active immune response. Understanding these distinctions highlights why exposure to antigens is core to the definition and development of activity immunity.