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The BCG vaccine is meant for protection against tuberculosis. Tuberculosis, also known as TB, is a highly contagious bacterial infection that primarily affects the lungs but can also impact other parts of the body. The BCG vaccine contains a weakened form of the tuberculosis bacteria and is given to infants and children to prevent them from developing active tuberculosis.
Option 1: Mumps is a viral infection that causes swelling of the salivary glands. The BCG vaccine does not provide protection against mumps.
Option 3: Leprosy, also known as Hansen`s disease, is a chronic bacterial infection. The BCG vaccine does not provide protection against leprosy.
Option 4: Tetanus is caused by a bacteria that enters the body through wounds. The BCG vaccine does not provide protection against tetanus.
In conclusion, the correct answer is option 2 - Tuberculosis.