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K. pneumonia. Negative control (A). 6.25 mg/mL TiO2 containing 0.03% silver (B). 12.5 mg/mL TiO2 containing 0.03% silver (C). 25 mg/mL TiO2 containing 0.03% silver (D). 50 mg/mL TiO2 containing 0.03% silver (E). It should be noted that there was no bacterial growth observed on the Mueller Hinton Agar plates (D,E).
