Biology - Human Health and Diseases Question with Solution | TestHub

When a person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response, it is called naturally acquired active immunity.

In the case of measles, the body's immune system actively produces antibodies and memory cells against the measles virus during the infection. Since the exposure to the pathogen happens naturally and the body actively builds immunity, this is an example of natural acquired active immunity.

Answer: natural acquired active immunity