Recovery, growth, and production of heat-stable enterotoxin by Escherichia coli after copper-induced injury.

Exposure of enterotoxigenic Escherichia coli strains to a sublethal concentration (0.75 mg/liter) of copper for 3 days at 4 degrees C induced sensitivity to deoxycholate (0.1%). When placed in a complex (brain heart infusion) or a defined amino acid salt medium, the copper-injured cells recovered their tolerance to deoxycholate in 3 and 6 h, respectively… CONTINUE READING