Table 3. Reduction of cell counts [mean±SD; Log (Y_t/Y₀)] of nine Listeria monocytogenes strains, which were non-habituated (0% NaCl) or habituated to 1%, 2% and 4% NaCl during heat challenge at 60℃ for 60 min

L. monocytogenes strains		Heating time (min)	NaCl concentration (%)
			0	1	2	4
Heat-sensitized group (HS)	NCCP 10805	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.0±0.4A	−3.2±0.1A	−3.1±0.1A	−3.2±0.4A
		40	−3.6±0.2A	−4.1±0.3B	−3.5±0.3A	−3.8±0.2AB
		60	−4.1±0.3A	−4.9±0.6B	−4.1±0.7A	−4.5±0.5AB
	NCCP 10806	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−2.7±0.3A	−3.0±0.1AB	−3.1±0.3B	−3.3±0.2AB
		40	−3.3±0.3A	−3.5±0.3A	−3.5±0.3A	−3.9±0.1B
		60	−3.8±0.2A	−4.5±0.3B	−4.5±0.3C	−4.3±0.3B
	NCCP 10807	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.1±0.2A	−3.4±0.2AB	−3.6±0.2B	−3.3±0.4AB
		40	−3.8±0.4A	−3.9±0.2A	−3.9±0.2A	−4.4±0.3B
		60	−4.5±0.5A	−4.9±0.4B	−4.7±0.3AB	−5.1±0.4B
	NCCP 10810	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−2.9±0.2A	−3.0±0.2A	−3.2±0.1AB	−3.4±0.3B
		40	−3.5±0.2A	−4.0±0.2B	−3.6±0.4A	−3.9±0.2B
		60	−4.1±0.2A	−4.3±0.2A	−4.0±0.3A	−4.8±0.4B
	NCCP 10811	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.2±0.5AB	−2.8±0.1A	−3.5±0.7B	−3.6±0.3B
		40	−3.7±0.6AB	−3.3±0.3A	−3.9±0.7B	−4.3±0.4B
		60	−4.4±0.7A	−4.0±0.4A	−4.6±0.8A	−5.2±0.3B
	NCCP 10920	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.0±0.2A	−3.1±0.2A	−3.0±0.2A	−3.3±0.1A
		40	−3.5±0.3A	−3.4±0.2A	−3.9±0.5B	−3.7±0.3AB
		60	−3.7±0.2A	−3.9±0.3A	−4.5±0.6B	−4.6±0.6B
Non heat-sensitized group (NS)	NCCP 10808	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.1±0.2A	−3.0±0.1A	−3.2±0.4A	−3.4±0.5A
		40	−3.8±0.2AB	−3.5±0.2A	−4.2±0.1B	−3.9±0.4AB
		60	−4.0±0.2A	−4.2±0.7A	−4.3±0.1A	−4.2±0.3A
	NCCP 10809	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−4.1±0.2A	−3.9±0.1A	−3.6±0.7A	−3.8±0.4A
		40	−4.3±0.3A	−4.4±0.3A	−4.1±0.7A	−4.1±0.2A
		60	−5.1±0.3A	−4.7±0.2A	−5.1±0.8A	−4.9±0.2A
	NCCP 10943	0	0.0±0.0A	0.0±0.0A	0.0±0.0A	0.0±0.0A
		20	−3.0±0.3AB	−3.0±0.1A	−2.9±0.2A	−3.2±0.1B
		40	−3.5±0.0A	−3.5±0.3A	−3.5±0.2A	−4.0±0.1B
		60	−4.2±0.2A	−4.4±0.3A	−4.1±0.3A	−4.3±0.3A