Which term refers to the body's ability to resist infection and disease?

The term that refers to the body's ability to resist infection and disease is immunity. Immunity encompasses the complex defense mechanisms developed by the body to protect against pathogens, such as viruses and bacteria. This can be achieved through natural immunity, which is acquired through exposure to infections, or through acquired immunity, which develops after vaccination.

Immunization, while related, is a process that involves introducing a vaccine to stimulate the immune system to build that protective response. Homeostasis refers to the body's ability to maintain stable internal conditions despite changes in the external environment, and does not specifically focus on the immune response. Infection denotes the invasion and multiplication of pathogenic microorganisms that can lead to disease, rather than the body’s protective capabilities. Therefore, immunity is the most accurate term that directly relates to resistance to infection and disease.