Question

BCG immunisation is used for

• A. Measles
• B. Tuberculosis
• C. Diphtheria
• D. Leprosy

Hint:

BCG is short for Bacillus Calmette Guerin, a vaccine given at birth against a lung disease caused by Mycobacterium tuberculosis.

Answer 1

The Correct Option is B

Step 1: Recall what BCG stands for.
BCG stands for Bacillus Calmette Guerin. It is a vaccine made from a weakened strain of a bacterium related to the one that causes tuberculosis. It is given to infants soon after birth as part of routine immunisation.

Step 2: Link the vaccine to the disease it prevents.
BCG trains the immune system to recognise and fight the bacterium Mycobacterium tuberculosis, which causes tuberculosis, mainly of the lungs. This is the main reason the vaccine is given so early in life in countries where tuberculosis is common.

Step 3: Rule out the other diseases.
Measles is prevented by the MMR or measles vaccine, not BCG. Diphtheria is prevented by the DPT vaccine, which also is not BCG. Leprosy is caused by a different bacterium and is not the main target of BCG, though BCG gives some partial protection against it as a side benefit, its primary use is against tuberculosis.

Final Answer:
BCG immunisation is used mainly for tuberculosis. \[ \boxed{\text{Tuberculosis}} \]