Table 2

Input parameters used in the scenario tree model to substantiate freedom from IBR and EBL in Switzerland

Description of input parameter

Value

Source


Herd-level design prevalence for disease freedom from IBR and EBL (P*H)

0.002

OIE Animal Health Code 2010


Proportions of risk factors for IBR in the cattle farm population (PrRF)


Proportion of "animal contacts" (PrAC)

0.401

TVD1

Proportion of "animal movements" (PrAM)

0.286

TVD1

Proportion of "farm close to border" (PrFcB)

0.100

TVD1

Proportion of "high density of herds" (PrhDH)

0.123

TVD1

Proportion of "importation of cattle" (PrIC)

0.002

TVD1


Proportions of risk factors for EBL in the cattle farm population (PrRF)


Proportion of "animal movements" (PrAM)

0.286

TVD1

Proportion of "importation of cattle" (PrIC)

0.002

TVD1

Proportion of "common summer pasture" (PrSP)

0.398

TVD1


Relative risks (RRRF) of risk factors for IBR


RR of "animal contacts" (RRAC)

RiskPert(2; 4; 6)

Expert opinion2

RR of "animal movements" (RRAM)

RiskPert(2; 4; 6)

Expert opinion2

RR of "farm close to border" (RRFcB)

RiskPert(2; 4; 6)

Expert opinion2

RR of "high density of herds" (RRhDH)

RiskPert(1; 2; 3)

Expert opinion2

RR of "importation of cattle" (RRIC)

RiskPert(2; 4; 6)

Expert opinion2


Relative risks (RRRF) of risk factors for EBL


RR of "animal movements" (RRAM)

RiskPert(1; 2; 3)

Expert opinion2

RR of "importation of cattle" (RRIC)

RiskPert(1.5; 4; 5)

Expert opinion2

RR of "common summer pasture" (RRSP)

RiskPert(1; 1.5; 3)

Expert opinion2


ELISA test-sensitivities for herd serology (TSensSH)


TSensSH of IBR-Antibody-ELISA (CHEKIT® Trachitest Serum, IDEXX Laboratories)

0.993

Swiss Reference Laboratory for IBR3

TSensSH of EBL-Antibody-ELISA (CHEKIT® Leucose Serum, IDEXX Laboratories)

0.999

Swiss Reference Laboratory for EBL4


1Swiss Animal Movement Database (2008)

2Modified Delphi approach

3Institute of Virology, University of Zurich

4Institute of Veterinary Virology, University of Berne

Blickenstorfer et al. BMC Veterinary Research 2011 7:49   doi:10.1186/1746-6148-7-49

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