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Vaccination and immunisation

The table below lists the medical details of 3 patients who were exposed to the tuberculosis bacterium.

Details	A	B	C
Duration of symptoms	4 months	6 months	1 week
Antibody production	Slow	Slow	Rapid
Antibody levels	Low	Low	High

The doctor’s notes indicate that one of the patients had been vaccinated, and showed signs of immunological memory of the virus.

Which patient is most likely to have received the BCG vaccine against tuberculosis?

Class 12 Biology (India)