TABLE 3.
Annual probability of enteric virus infection associated with consuming vegetables that have been spray irrigated with secondary effluent from four different treatment plants and where the viral kinetic decay constant (k) is assumed to be 0.69 day−1
Crop | Time (days)b |
PA(λ) (UCL0.95)a
|
|||
---|---|---|---|---|---|
MRWPCA AS | OCSD AS | OCSD TF | Pomona AS | ||
Broccoli | 1 | 3.1 × 10−2 | 6.3 × 10−3 | 2.8 × 10−2 | 3.3 × 10−3 |
7 | 5.3 × 10−3 | 5.5 × 10−4 | 3.1 × 10−3 | 6.0 × 10−4 | |
14 | 8.5 × 10−5 | 6.4 × 10−6 | 3.9 × 10−5 | 1.2 × 10−5 | |
Cucumber | 1 | 2.7 × 10−2 | 1.9 × 10−3 | 1.8 × 10−2 | 2.0 × 10−3 |
7 | 2.5 × 10−3 | 4.0 × 10−5 | 9.7 × 10−4 | 4.8 × 10−4 | |
14 | 3.8 × 10−5 | 3.2 × 10−7 | 1.9 × 10−5 | 1.8 × 10−5 | |
Savoy King/Grand Slam (cabbage) | 1 | 6.0 × 10−2 | 1.1 × 10−2 | 4.7 × 10−2 | 4.6 × 10−3 |
7 | 9.5 × 10−3 | 5.6 × 10−4 | 4.8 × 10−3 | 1.1 × 10−3 | |
14 | 3.8 × 10−4 | 5.4 × 10−6 | 9.7 × 10−5 | 1.7 × 10−4 | |
Winter Head (cabbage) | 1 | 8.2 × 10−2 | 1.8 × 10−2 | 6.9 × 10−2 | 6.8 × 10−3 |
7 | 1.7 × 10−2 | 1.2 × 10−3 | 9.4 × 10−3 | 1.5 × 10−3 | |
14 | 7.6 × 10−4 | 1.2 × 10−5 | 1.9 × 10−4 | 2.7 × 10−4 | |
Lettuce | 1 | 2.0 × 10−1 | 4.1 × 10−2 | 1.7 × 10−1 | 1.5 × 10−2 |
7 | 4.1 × 10−2 | 2.9 × 10−3 | 2.3 × 10−2 | 2.8 × 10−3 | |
14 | 1.2 × 10−3 | 7.1 × 10−5 | 4.2 × 10−4 | 3.3 × 10−4 |
Estimates were derived from 10,000 Latin hypercube iterations of the model.
Duration of environmental exposure.