Table 1. Definitions of the parameters used in the model.
Definition (units) | Parameter | Estimate | Reference |
Number of pigs per pen | N | 25 | [41] |
Number of pens on either side of a corridor | PensPerSide | 20 | [41] |
Infection rate | β | Assume 1.67×10−3 | – |
The rate at which a pig ceases to remain infectious (day−1) | γ | 1/26 = 0.03846 | [14], [19] |
The rate at which a carrier becomes re-infectious (day−1) | δ | 1/108 = 0.00926 | – |
The rate at which a pig ceases to carry the bacteria (day−1) | ε | 1/60 = 0.01667 | [14] |
Loss of immunity (day−1) | ν | 0.5 | – |
Shedding rate (cfu day−1) | λ | 2.25×104 | [42], [43] |
Proportion of cfu present ingested (day−1): Slatted | κ | 4.23×10−4 | [43], [44] |
Solid | 3.17×10−5 | ||
Bacteria death rate (day−1) | l | 1/84 = 0.01190 | [45] |
Probability of infection from bacterial consumption | p | 2.30×10−6 | [19], [46] |
Cross infection rate | α | Assume 1.14×10−6 | – |
Proportion of faeces that remains in a room | π | 0.4 | – |
Proportion of faeces that remains present after cleaning | q | 0.1 | – |
Time spent in unit (days) | Tmax | 108 | [26] |
Airborne infection rate | ω | Assume 1.02×10−14 | – |
Reproduced from Table 2 of [11].