Table 2 Input parameters used in the scenario tree model to substantiate freedom from IBR and EBL in Switzerland

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 (Pr _RF )

Proportion of "animal contacts" (Pr_AC)

0.401

TVD¹

Proportion of "animal movements" (Pr_AM)

0.286

TVD¹

Proportion of "farm close to border" (Pr_FcB)

0.100

TVD¹

Proportion of "high density of herds" (Pr_hDH)

0.123

TVD¹

Proportion of "importation of cattle" (Pr_IC)

0.002

TVD¹

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

Proportion of "animal movements" (Pr_AM)

0.286

TVD¹

Proportion of "importation of cattle" (Pr_IC)

0.002

TVD¹

Proportion of "common summer pasture" (Pr_SP)

0.398

TVD¹

Relative risks (RR _RF ) of risk factors for IBR

RR of "animal contacts" (RR_AC)

RiskPert(2; 4; 6)

Expert opinion²

RR of "animal movements" (RR_AM)

RiskPert(2; 4; 6)

Expert opinion²

RR of "farm close to border" (RR_FcB)

RiskPert(2; 4; 6)

Expert opinion²

RR of "high density of herds" (RR_hDH)

RiskPert(1; 2; 3)

Expert opinion²

RR of "importation of cattle" (RR_IC)

RiskPert(2; 4; 6)

Expert opinion²

Relative risks (RR _RF ) of risk factors for EBL

RR of "animal movements" (RR_AM)

RiskPert(1; 2; 3)

Expert opinion²

RR of "importation of cattle" (RR_IC)

RiskPert(1.5; 4; 5)

Expert opinion²

RR of "common summer pasture" (RR_SP)

RiskPert(1; 1.5; 3)

Expert opinion²

ELISA test-sensitivities for herd serology (T _SensSH )

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

0.993

Swiss Reference Laboratory for IBR³

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

0.999

Swiss Reference Laboratory for EBL⁴