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Table 1 Parameters in a SIS E VTEC O157 model

From: Data-driven network modelling of disease transmission using complete population movement data: spread of VTEC O157 in Swedish cattle

Parameter

Description (unit)

Value

α

Rate of shedding from infected individuals (units per day)

1.00 × 100

β q1

Decay of environmental infectious pressure in quarter 1 (per day)

1.75 × 10−1

β q2

Decay of environmental infectious pressure in quarter 2 (per day)

1.19 × 10−1

β q3

Decay of environmental infectious pressure in quarter 3 (per day)

0.80 × 10−1

β q4

Decay of environmental infectious pressure in quarter 4 (per day)

1.58 × 10−1

\(\upsilon_{c}\)

Indirect transmission rate of the environmental infectious pressure in calves (per animal per day)

3.83 × 10−2

\(\upsilon_{y}\)

Indirect transmission rate of the environmental infectious pressure in young stock (per animal per day)

3.83 × 10−2

\(\upsilon_{a}\)

Indirect transmission rate of the environmental infectious pressure in adults (per animal per day)

5.88 × 10−3

\(\gamma_{c}\)

The recovery rate of infection in calves (per day)

1.00 × 10−1

\(\gamma_{y}\)

The recovery rate of infection in young stock (per day)

1.00 × 10−1

\(\gamma_{a}\)

The recovery rate of infection in adults (per day)

1.00 × 10−1

ε

Background environmental infectious pressure (units per day)

6.89 × 10−5

  1. Parameters in a stochastic simulation to explore the spread of Verotoxigenic Escherichia coli O157:H7 (VTEC O157) in the entire Swedish cattle population based on data reported to the Swedish Board of Agriculture during the period 2005-07- 01 to 2013-12-31. The within-herd disease spread was modelled with a SISE compartment model the two disease states: susceptible (S) and infected (I) and E representing the environmental compartment contaminated with VTEC O157 by infected animals. The decay of the environmental infectious pressure was varied in each of the four quarters of the year. Individuals were divided into the following three age categories; calves 0–119 days, young stock 120–364 days and adults older than 364 days.