Question

Select the correct statement with respect to diseases and immunisation.

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

Answer 1

Answer: (A)

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

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.