Active natural immunity occurs when
A) antibodies pass from a pregnant mother to her fetus.
B) antibodies are injected into a host.
C) an individual develops a disease.
D) a person is vaccinated.
E) antibodies are passed in breast milk.

Question

Quizplus · Accepted Answer

Active natural immunity occurs when an individual is exposed to a pathogen, becomes ill, and then recovers, during which the immune system develops a memory of the pathogen, leading to long-term immunity against the disease.

Active Natural Immunity Occurs When