TABLE 3.

Detection of E. coli, FRNA bacteriophages, and NLVs in market-ready oysters obtained from each site during summer and winter months

Season	Site	E. coli		FRNA bacteriophages		% Positive for NLVs (n)a
		% Positive (n)	Geometric mean concn (MPN/100 g)	% Positive (n)	Geometric mean concn (PFU/100 g)
Summerb	1	0 (6)	0.0	0 (6)	0.0	0 (3)
	2	0 (14)	0.0	0 (14)	0.0	0 (5)
	3	8 (12)	0.4	25 (12)	3.6	0 (6)
	4	0 (26)	0.0	23 (26)	3.6	0 (14)
Winterc	1	0 (7)	0.0	0 (7)	0.0	0 (4)
	2	12 (25)	0.6	64 (25)	49.1	0 (10)
	3	17 (12)	0.7	92 (12)	386.8	0 (7)
	4	28 (32)	2.2	100 (32)	1,865.5	62 (21)

^aSeven-gram samples were used. 

^bApril to September inclusive. 

^cOctober to March inclusive.