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Urease activity was measured as described previously (55). Briefly, overnight cultures of bacteria were washed once in sterile saline and adjusted to ∼5 × 109 CFU/ml. Cultures were then diluted 1:10 in filter-sterilized human urine supplemented with 0.001%, wt/vol, phenol red and 500 mM urea and dispensed into the wells of a clear-bottom 96-well plate. Absorbance (OD562) was measured every 30 s for a total of 90 min in a BioTek Synergy H1 reader.

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