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DPT stands for Diphtheria, Pertussis, Tetanus. It is a vaccine provided protection against these three diseases.
DDT stands for DichloroDiphenylTrichloroenthane ,it is a pesticide.
BCG stands for Bacillus Calmette-Guerin. It is a vaccine that provides protection against Tuberculosis.

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DDT- DichloroDiphenylTrichloroethane
BCG- Bacillus Calmette-Guerine
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