In some areas of the world, a tuberculosis vaccine known as bacillus calmette-guã©rin (bcg) is used. it is not used in the united states. every person who has received this vaccine and mounted a protective response will have a positive reaction in a tuberculin skin test. why? what does this mean for the usefulness of this skin test in those countries where this vaccine is used?
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In some areas of the world, a tuberculosis vaccine known as bacillus calmette-guã©rin (bcg) is used....
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