write a proper paraphrase and include an in-text citation.

"Immunity is the ability to resist infection. It can occur naturally when someone isinfected and their body mountsa successful immune response against it. To do so, the immune system creates both general antibodies and specific protection against the particular infection and retains a sort of memory to resist it coming back. Or we can gain immunity by vaccination with inactive or weakened forms of the virus to stimulate an immune response" (Zafar, 2020, paras. 9-11).