Biology
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The administration of a weakened pathogen to stimulate the immune system to develop resistance against that pathogen is called _________.
Related Questions
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_________ vaccine is given to children as a preventive measure against tuberculosis.
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AIDS is caused by _________ virus.
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Bites of poisonous snakes can only be treated with _________ serum.
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A _________ is a crack in the bone which requires immediate medical attention.