Interferons are ...........

Which pair of white blood cells is involved in cellular barriers?

In which type of acquired immunity are ready-made antibodies introduced into the host body?

Introduction of attenuated pathogens in human body results in . . . . . . .

In case of snakebites,the injection given to patients contains preformed antibodies against the snake venom. This type of immunisation is called . . . . . . .

When the body attacks its own cells,resulting in damage to the body,it is called .......