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(a, b) Effect of pH on Klebsiella aerogenes and antibacterial efficacy of (a) 1% and (b) 10% CA as a function of pH. (c, d) Effect of pH on Escherichia coli and antibacterial efficacy of (c) 1% and (d) 10% CA as a function of pH. *Statistically different when P < 0·01, **statistically different when P < 0·001. x: Same as pH 6·5 control. 
[Bacteria] in growth control, 
[Bacteria] in pH control, 
[Bacteria] in 1 or 10% CA, 
pHm of growth control, 
pHm of control, 
pHm of sample.
