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Table 1 Definition of parameters and values used for model simulations

From: Development of a stochastic agent-based model to evaluate surveillance strategies for detection of emergent porcine reproductive and respiratory syndrome strains

Parameter

Value (unit)

Time to PRRSVa elimination for breeding sites

385 (days)b

Time to PRRSV elimination for AIAOcnurseries

56 (days)

Time to PRRSV elimination for AIAO finishers/ wean-to-finish sites

112 (days)

Baseline probability of infection with PRRSV (new strain)

10% per year

Percent of the swine sites considered “completely susceptible”

63%d

Relative Risks for getting infected with PRRSV

 

Relative risk of getting infected with PRRSV for nurseries compared to breeding sites

1.2

Relative risk of getting infected with PRRSV for finishers/ wean-to-finish sites compared to breeding sites

1.5

Relative risk of getting infected with PRRSV for sites with no shower in facility compared to sites with shower

1.3

Relative risk of getting infected with PRRSV for sites with continuous flow compared to sites with AIAO

1.5

Relative risk of getting infected with PRRSV for sites with medium number of neighbours compared to sites with no neighbours

1.5

Relative risk of getting infected with PRRSV for sites with high number of neighbours compared to sites with no neighbours

2.0

Relative risk of getting infected with PRRSV for sites with medium number of animals compared to sites with reduced number of animals

1.5

Relative risk of getting infected with PRRSV for sites with high number of animals compared to sites with reduced number of animals

2.0

Relative risk of getting infected with PRRSV for naïve sites compared to sites with complete immunity

2.0

Relative risk of getting infected with PRRSV for sites infected with other PRRSV strains (partial immunity) compared to sites with complete immunity

1.5

  1. Formula for probability of infection
  2. 0.10 (relative risk [RR]) animal flow (RR) number of neighbors (RR) presence of shower (RR) number of animals (RR) production type (RR) immunity status
  3. aPorcine reproductive and respiratory syndrome virus
  4. bLinhares et al., 2014 [21]
  5. cAll-in, all-out animal flow
  6. dArruda et al., 2015 [22]