The cell which plays major role in host defense against tumor cells and the cells infected with viruses

Natural killer cell have cytotoxic activity  which work against the number of tumor cell lime or particularly  against the virus infected cells. During the process apart from the phagocytes, another type of cells called natural killer cells which kills virus infected cells and tumor cells of body by creating perforins lined pores in the plasma membrane of target cells. water enters through these pores causing swelling and bursting of the diseased cells.

B lymphocytes produces antibodies in response to pathogen or antigens into our blood to fight with them.

Interferons have the ability to limits the infection of virus.

Neutrophils show phagocytosis.