Passive immunity can be conferred directly by

Options

A. vaccines
B. antitoxins
C. colostrum
D. both (b) and (c )

Answer

D

Explanation

Transfer of immune products like antibodies and immunoglobulins to a recipient is called passive immunity. Colostrum, a yellowish milk secreted by mother during the initial days of lactaion has abundant antibodies to protect the infant. In tetanus, we need to directly inject the preformed antibodies or antitioxin (a preparation containing antibodies to the toxin). These both are examples of passive immunity.