B.C.G vaccines are usually given to:
Correct answer: A. Children
- A. Children
- B. Adults
- C. Special populations
- D. All of the above
Explanation
The Bacillus Calmette-Guerin (BCG) vaccine is primarily given to children, especially in countries where tuberculosis (TB) is prevalent, because it is most effective at preventing severe forms of TB in young children. It is not typically given to adults because its effectiveness in preventing TB in adults is limited. Similarly, while some special populations might receive the vaccine, it is not routinely administered to all of them.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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