"Lifelong" Immunity Would Most Likely Be Natural or Artificial Active

Question

"Lifelong" immunity would most likely be natural or artificial active immunity.

Accepted Answer

Lifelong immunity would most likely be a result of natural active immunity, which occurs when the body produces its own antibodies in response to exposure to a pathogen. This type of immunity can last a lifetime because the immune system "remembers" the pathogen and can quickly produce the necessary antibodies if re-exposed to it. Artificial active immunity, such as from a vaccine, can also provide long-lasting immunity, but it is not always lifelong.