Autoimmunity is a result of the immune system's confusion.
the branch of immunology that deals with pathologies of the immune system
a virus called {poliovirus}
impregnate with the virus or germ of a disease in order to render immune
a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease
Cell-mediated immunity destroys the cell infected by the virus.