- The need to be exposed to a pathogen or to the antigen of a pathogen, which leads to the production of antibodies
- The cells involved are of three types: T cells, B cells and anti-presenting cells
- Immunity is acquired after several exposures to the antigen
- Active immunity can last up to an entire life
- This type of immunity can cause at most some autoimmune disease and allergies, however, there are no issues generally.
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