Detection and Quantification of Total and Pathogenic Vibrio parahaemolyticus in Anadara subcrenata in the Zhoushan Archipelago

Table 5

Prevalence of contamination of pathogenic Vibrio parahaemolyticus in Anadara subcrenata in different seasons.

Seasons	Number of samples	No. of positive samples	Positive rate (%)	Number of samples with pathogenic V. parahaemolyticus (MPN/g)					Densities of tdh or tlh positive samples (MPN/g)
				None detected	<10	10–10^2	10^2–10^3	>10^3	Median	Min–max
Spring	56	10	17.85	46	7	2	1	0	3.3	0.92–240
Summer	98	8	8.16	90	5	2	1	0	3.6	0.36–210
Autumn	69	7	10.14	58	5	2	0	0	9.2	3.00–23.00
Winter	64	0	0	64	0	0	0	0	—	—
Total	265	25	9.43	240	17	6	2	0	6.4	0.30–240

The positive rate of pathogenic V. parahaemolyticus from different seasons was significantly different ().