Big scientific encyclopedia "Immunology and Virology". The functioning of the immune system is studied by the science of immunology. Immunology studies the body's reactions to antigens. The immune system protects the body from infections, toxins, and cancer cells. The immune system must recognize a wide range of pathogens, from viruses to multicellular worms, and distinguish them from the body's own healthy tissues. Immunological memory forms the basis of vaccination and allows the body to de