Question

Select the correct statement with respect to disease and immunization :

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

Answer 1

The Correct Option is B

To understand which statement is correct regarding disease and immunization, let's review the given options:

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

Explanation:

• Option 1: Injection of snake antivenom against snake bite is an example of active immunisation.
• Explanation: Snake antivenom provides passive immunity, not active. Antivenom contains antibodies that have been produced in another organism to neutralize the venom. Active immunity involves the host's immune system actively generating antibodies.

• Option 2: If due to some reason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen.
• Explanation: B-and T-lymphocytes are crucial components of the adaptive immune system. B-lymphocytes produce antibodies against pathogens, while T-lymphocytes help regulate immune responses and assist in the immune response to pathogens. If these cells are damaged, the immune system's ability to generate an effective response to new infections is compromised. Hence, the body will not produce antibodies, making this statement correct.

• Option 3: Injection of dead/inactivated pathogens causes passive immunity.
• Explanation: This statement is incorrect as the injection of dead or inactivated pathogens is the basis for many vaccines, which stimulate the body's own immune system to produce an immune response and memory, thus providing active immunity.

• Option 4: Certain protozoans have been used to mass produce hepatitis B vaccine.
• Explanation: This statement is incorrect. The hepatitis B vaccine is produced using yeast or mammalian cells through recombinant DNA technology, not protozoans.

Conclusion:

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