TABLE 1.

Pearson’s correlation coefficients comparing the use of the colony overlay procedure for peptidases assay with direct plating and most-probable-number–PCR assays for total (vvhA) and virulent (vcgC) V. vulnificus and total (tlh) and virulent (tdh and trh) V. parahaemolyticus

Pathogen and gene	Comparison	Correlation coefficient (r value, significance level)a
		Seawater	Oysters
Total
V. vulnificus vvhA	COPP vs DP	0.69, <0.0001	0.62, <0.0001
	COPP vs MPN-PCR	0.50, <0.0001	0.56, <0.0001
	DP vs MPN-PCR	0.42, <0.0001	0.59, <0.0001
V. parahaemolyticus tlh	COPP vs DP	0.63, <0.0001	0.34, 0.0003
	COPP vs MPN-PCR	0.65, <0.0001	0.23, 0.177
	DP vs MPN-PCR	0.66, <0.0001	0.67, <0.0001
Pathogenic
V. vulnificus vcgC	COPP vs DP	0.42, <0.0001	0.40, <0.0001
	COPP vs MPN-PCR	0.38, <0.0001	0.33, <0.0003
	DP vs MPN-PCR	0.40, <0.0001	0.40, <0.0001
V. parahaemolyticus
tdh	COPP vs DP	0.31, 0.0009	0.32, 0.0006
	COPP vs MPN-PCR	0.32, 0.0006	−0.04, 0.6214
	DP vs MPN-PCR	0.54, <0.0001	0.31, 0.0008
trh	COPP vs DP	0.44, <0.0001	0.39, <0.0001
	COPP vs MPN-PCR	0.38, <0.0001	−0.02, 0.7791
	DP vs MPN-PCR	0.49, <0.0001	0.34, 0.0003

^aNumbers in bold are correlation coefficients of 0.40 or higher.