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Select the correct statement with respect to diseases and immunisation:

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

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

Solution

B-lymphocytes are the cells that differentiate into plasma cells and secrete antibodies, while T-lymphocytes help coordinate the response. If both are damaged, antibody production against a pathogen will fail. The other options confuse active vs passive immunity or give an incorrect vaccine source.

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