Immunity tolerance developed by

Humoral immunity is due to

Give scientific reasons : Virus infected cells provide innate immunity to other cells.

Which of the following immune responses is responsible for rejection of kidney graft?

The old worn out $RBCs$ are filtered out by

The yellowish fluid "colostrum" secreted by mammary glands of mother during the initial days of lactation has abundant antibodies ($lgA$) to protect the infant. This type of immunity is called as