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Inactivation of Bacillus species spores exposed to 2.0 mg/liter free chlorine under different conditions. (A) pH 7, 5°C; (B) pH 7, 23°C; (C) pH 8, 5°C; (D) pH 8, 23°C. Symbols: •, B. anthracis Sterne; ▿, B. cereus; ▪, B. thuringiensis subsp. israelensis.
