BCG vaccine contains

Live but attenuated bacteria

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Killed bacteria

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Toxoids against TB-bacteria

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Antibodies against bacteria

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Solution

The correct option is A Live but attenuated bacteria
The BCG vaccine contains a live but weakened form of a type of bacteria called Mycobacterium bovis which causes tuberculosis (TB) in cattle. The bacteria are altered so that they do not cause a TB infection, but stimulate the immune system to make resistant to the disease. The vaccine is known as BCG because a strain of the bacterium known as Bacillus Calmette-Guerin is used.

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