What type of immunity results when a patient recovers from a disease and develops memory?

What type of immunity results when a patient recovers from a disease and develops memory?

• A. Natural passive
• B. Natural active
• C. Artificial active
• D. Passive immunity

Answer: (B)

The type of immunity that develops when a patient recovers from a disease and subsequently forms memory cells is classified as natural active immunity. This process occurs when the immune system is exposed to a pathogen, such as a virus or bacterium, and responds by producing antibodies and memory cells specific to that pathogen. Once the individual has recovered from the infection, these memory cells remain in the body, allowing for a faster and more effective immune response if the same pathogen is encountered again in the future.

Natural active immunity is distinct from other forms of immunity. For instance, passive immunity involves receiving antibodies from another source rather than producing them through one’s own immune response, as seen in natural passive immunity (like antibodies transferred from mother to infant through breast milk) or artificial passive immunity (such as receiving an injection of antibodies). Artificial active immunity, on the other hand, refers to immunity developed through vaccination, where a harmless form of the pathogen is introduced to stimulate an immune response.

Therefore, when an individual recovers from an illness and develops their own long-lasting immunity with memory cells, it exemplifies natural active immunity.