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germ warfare	the deliberate contamination of an enemy's territory with disease germs.
infection	contamination or invasion by germs or disease. [2/5 definitions]
purify	to free from dirt, contamination, or other unwanted elements. [1/3 definitions]
purity	the state or quality of being free from defects or contamination. [1/2 definitions]
recontamination	combined form of contamination.

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