Table 3.

Infection risks associated with poliovirus-contaminated spinach after treatment with various E-beam irradiation doses

E-beam irradiation dose (kGy) (% poliovirus reduction)	Infection riska for each initial poliovirus contamination level (PFU/g)
	1,000	1000	10	1
1.15 (88.3)	5.73 × 10−1	8.17 × 10−2	8.48 × 10−3	8.52 × 10−4
2.04 (97.9)	1.42 × 10−1	1.52 × 10−2	1.53 × 10−3	1.53 × 10−4
3.05 (99.2)	5.66 × 10−2	5.81 × 10−3	5.82 × 10−4	5.82 × 10−5
4.0 (98.9)	7.70 × 10−2	7.98 × 10−3	8.01 × 10−4	8.01 × 10−5

^aProbability of infection.