Does your body remember viruses that it meets?

Yes, the body's immune system remembers viruses that it encounters. This is known as immunological memory. Immunological memory allows the body to mount a faster and more effective immune response when it encounters the same virus again in the future. This is the basis for vaccinations, which stimulate the immune system to produce antibodies against a virus without causing disease. Memory B cells and memory T cells are responsible for immunological memory. Memory B cells quickly produce antibodies when exposed to a familiar virus, and memory T cells help activate B cells and kill virus-infected cells.