Table 1. Survival of Salmonella Typhimurium strains on eggshell surface after 21 days of incubation: Comparison between washed and unwashed eggs at 20°C.

Salmonella Typhimurium strain	Dose of infection (CFU/mL)	Washing status	Eggshell contamination after incubation (Log CFU/eggshell) Mean ± SE	p-value
S. Typhimurium strain 1	103	Washed	3.09±0.82	0.68
		Unwashed	2.51±1.08
	105	Washed	4.09±0.27	0.34
		Unwashed	4.41±0.16
S. Typhimurium strain 2	103	Washed	2.69±1.09	0.54
		Unwashed	3.58±0.89
	105	Washed	4.49±0.01	0.37
		Unwashed	3.58±0.89
S. Typhimurium strain 3	103	Washed	2.23±0.92	0.33
		Unwashed	0.89±0.89
	105	Washed	3.42±0.92	0.34
		Unwashed	1.90±1.17
S. Typhimurium strain 4	103	Washed	0.89±0.89	0.62
		Unwashed	1.56±0.96
	105	Washed	4.34±0.21	0.27
		Unwashed	3.22±0.85
S. Typhimurium strain 5	103	Washed	1.67±1.04	0.59
		Unwashed	2.51±1.05
	105	Washed	2.12±0.88	0.06
		Unwashed	4.42±0.20