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Select the correct statement with respect to diseases and immunisation.
A
Certain protozoans have been used to mass produce hepatitis B vaccine
B
Injection of snake antivenom against snake bite is an example of active immunisation
C
If due to some reason B- and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
D
Injection of dead / inactivated pathogens causes passive immunity
Detailed Solution
Antibodies are produced by B-lymphocytes (which form plasma cells), and T-lymphocytes (helper T-cells) help the B-cells to produce them. If both B- and T-lymphocytes are damaged, no antibodies will be produced against a pathogen. This statement is correct.
Hepatitis B vaccine is produced by recombinant DNA technology in yeast, which is a fungus, not a protozoan.
Snake antivenom contains preformed antibodies, so its injection is passive immunisation, not active.
Injection of dead or inactivated pathogens (vaccination) makes the body produce its own antibodies and memory cells, which is active immunity, not passive.
Hence the correct statement is the one about damage to B- and T-lymphocytes.
Hepatitis B vaccine is produced by recombinant DNA technology in yeast, which is a fungus, not a protozoan.
Snake antivenom contains preformed antibodies, so its injection is passive immunisation, not active.
Injection of dead or inactivated pathogens (vaccination) makes the body produce its own antibodies and memory cells, which is active immunity, not passive.
Hence the correct statement is the one about damage to B- and T-lymphocytes.