Selecting amediuminwhich the bacteria produce an impedance response
is important in developing an enumeration test based on impedance.
Preliminary trials with TSB showed a rapid and reproducible
change in theM-value for all Y. enterocolitica strains. Thus, TSBwas chosen
to establish the calibration. Y. enterocolitica was pre-cultured at its
optimal growth temperature, 25 °C however 30 °C was used to develop
the impedance calibration in order to achieve a fast result