Phenotypic and Genotypic Characterization of Animal-Source Salmonella Heidelberg Isolates

Table 1

Summary statistics on exponential growth rate (EGR) measurements and number of unique PFGE patterns for Salmonella Heidelberg isolates by isolate source, time frame of recovery, and species of origin.

	Exponential growth rate (EGR)			Number of unique PFGE patterns
	Mean	SD	CV
Isolate source
Clinical ()	1.84	0.18	0.10	14
Environmental ()	1.90	0.13	0.07	8
Time frame of isolation
Prior to 2006 ()	1.90	0.08	0.04	6
2006–2011 ()	1.88	0.09	0.05	9
2012-2013 ()	1.86	0.19	0.10	11
Species of origin
Chicken ()	1.87	0.18	0.09	12
Bovine ()	1.83	0.06	0.03	6
Turkey ()	1.92	0.08	0.04	3
Equine ()	1.94	0.11	0.06	2

PFGE = pulse field gel electrophoresis; SD = standard deviation; CV = coefficient of variation.