👉 In biological and medical terms, a "preexposure" is a process in which an organism has been exposed to a substance before it was infected with a disease or had its immune system activated. This can include exposure to pathogens such as bacteria, viruses, fungi, parasites, or other microorganisms that could cause illness. The term "preexposure" refers to the stage of infection where the organism is not yet fully susceptible to the disease and has an increased risk of becoming infected.
