TABLE 3.

Incidence of seed contamination before and after decontamination and concurrent chaff contamination^a

	Seed and chaff contamination					Seed sanitation
	No. of pools tested	Incidence of contamination (no. of pools)			Probability	No. of pools tested	Incidence of contamination after treatmentb (no. of pools)
		Chaff	Seed	Both			Vortexing	Sonication	Chlorine
S. enterica serovar Newport	29	4	1	3	0.017	10	10	8	5
E. coli O157:H7	45	6	3	6	0.033	8	8	8	3
Total	74	10	4	9	0.025c	18	18	16	8

^aA total of 1,000 seeds, from each pool were tested (see Materials and Methods). The number of pools where contamination was found in only chaff or seed or in both chaff and seed is shown as incidence of contamination.

^bNumber of pools where contamination was found in samples of 1,000 seeds after vortexing, sonication, and chlorine treatment.

^cAverage chi-square probability for S. enterica serovar Newport and E. coli O157:H7-contaminated pools.