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(a) Entry of S. typhi into the VBNC state in a microcosm at −20°C, as determined by AODC (■), DVC (●) and plate counting (▲) methods. (b) Entry of S. typhi into the VBNC state in a microcosm stimulated by CuSO4 at concentrations of 0.01 mmol/L (▼) and 0.015 mmol/L (▲) by plate counting, AODC (■) and DVC (●).
