Microbial load (log10 CFU/g) at the end of the incubation period is indicated in parentheses and shaded boxes indicate growth determined by plate counts but no TTD. NT¼ not
tested, and nd ¼ not detected by plate counts.
a Detectable growth is indicated by TTDs requiring three successive 11 mS changes (S.I. ¼ starting inoculum in log10 CFU/g, TTD in hh:mm).