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. 2010 Mar 25;5(3):e9888. doi: 10.1371/journal.pone.0009888

Table 5. Relative risk of exposure for farms that hire part-time workers (95% confidence interval)*.

2 day viral survival on a service vehicle
Same integrator group as index farm Different integrator group
Days of infectiousness at index farm Day laborer scenario Intermittent worker scenario Day laborer scenario Intermittent worker scenario
2 days 3.8 (3.0, 5.2) 1.7 (1.5, 2.0) 14.7 (11.4, 17.0) 4.2 (3.4, 4.7)
5 days 4.5 (2.8, 6.8) 1.3 (1.1, 1.4) 14.5 (11.1, 17.0) 2.0 (1.7, 2.2)
10 days 4.9 (3.5, 6.7) 1.1 (1.1, 1.1) 13.9 (10.4, 16.6) 1.3 (1.2, 1.3)
15 days 5.4 (3.9, 7.1) 1.0 (1.0, 1.0) 13.4 (9.8, 16.2) 1.0 (1.0, 1.1)

*Reference group is farms who do not hire part-time workers with the same model parameters (viral survival on a service vehicle, days of infectiousness, and integrator affiliation).