A less specific measurement of effectiveness is the United States Environmental Protection Agency ( EPA ) classification into either " high ", " intermediate " or " low " levels of disinfection . " High-level disinfection kills all organisms, except high levels of bacterial spores " and is done with a chemical germicide marketed as a sterilant by the U . S . Food and Drug Administration ( FDA ) . " Intermediate-level disinfection kills mycobacteria, most viruses, and bacteria with a chemical germicide registered as a'tuberculocide'by the Environmental Protection Agency.
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