ano ang kasalungat ng mamamasyal?
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They were two French scientists who from 1905 had been working on developing a vaccine against TB. BCG is an abbreviation of Bacillus Calmette-Guerin, meaning the bacilli of Calmette and Guerin. Between 1905 and 1918, Calmette and Guerin carried out research into the mechanisms of tuberculosis infection.
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