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Question:

Select the correct statement with respect to diseases and immunisation. Injection of dead / inactivated pathogens causes passive immunity. Certain protozoans have been used to mass produce hepatitis B vaccine. Injection of snake antivenom against snake bite is an example of active immunisation. If due to some reason B- and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen.

If due to some reason B- and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen.

Injection of snake antivenom against snake bite is an example of active immunisation.

Injection of dead / inactivated pathogens causes passive immunity.

Certain protozoans have been used to mass produce hepatitis B vaccine.

Solution:

The immune response depends on B and T cells interacting with each other to provide an effective defence. T cells are the coordinators and they stimulate B cells to divide and secrete antibodies into the blood - these antibodies destroy on the antigenic pathogens and the T cells then seek out and kill any of the body's own cells.