The coupons were transferred,
without contact with saturated salt solution, to 50-ml centrifuge tubes
in which the RH had been adjusted to 43%. The caps were firmly closed
and tubes were incubated at 22 °C for 1, 3, 6, 9, and 12 h. At each sampling
time, the number of viable E. coli O157:H7 on wooden coupons
was determined as described above
The coupons were transferred,without contact with saturated salt solution, to 50-ml centrifuge tubesin which the RH had been adjusted to 43%. The caps were firmly closedand tubes were incubated at 22 °C for 1, 3, 6, 9, and 12 h. At each samplingtime, the number of viable E. coli O157:H7 on wooden couponswas determined as described above
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