Table 1.

Parameters and values used for calculation of R₀

Symbol	Unit	Biological meaning	Values	Reference
m	midge/trapping night	Vector density (average)	1–584	[5]
a	bite/day	Vector biting rate	0.25	[15]
b1	successful bites/midge	Transmission from vector to cattle	0.01	[28]
b2	%infectious bite/infected host	Transmission from cattle to vector	0.9	[26]
r	cattle/day	Recovery rate of cattle	0.04	[17]
λ	cattle/day	Cattle death rate	0.00008	[17]
e		2.718	2.718	Universal value
μ	vector/day	Vector death rate	0.1–0.6	[29]
τ	Days	Extrinsic incubation period	4–28	[28]

Symbols and their biological meaning used to calculate BT transmission values for Switzerland