The potential spread of severe footrot in Norway if no elimination programme had been initiated: a simulation model

Table 2 Overview of demographic data, climatic rate and infection rate for modelling spread of severe footrot

County	N ^o of sheep flocks (nSh)	N ^o of cattle herds (nCa)	N ^o of combined flocks ( *nShCa*)	N ^o of isolated flocks	Mean number of neighbouring flocks ( \( {\overline{n}}_{1\boldsymbol{km},\boldsymbol{i}} \) )	Climatic rate (Cl _i /Cl _Rog )	Infection rate (β) (minimum, mode, maximum)
Østfold	160	360	43	49	0.2	0.61	0.04, 0.05, 0.05
Akershus	226	359	45	43	0.8	0.61	0.17, 0.19, 0.20
Oslo	8	5	4	6	0.0001*	0.67	0.01, 0.01, 0.01
Hedmark	669	1108	200	99	1.4	0.51	0.24, 0.28, 0.29
Oppland	1323	2224	324	60	1.6	0.51	0.28, 0.32, 0.34
Buskerud	552	593	111	53	1.5	0.56	0.29, 0.33, 0.35
Vestfold	129	225	29	25	0.3	0.69	0.07, 0.08, 0.09
Telemark	372	360	72	54	1.3	0.67	0.30, 0.35, 0.36
Aust-Agder	220	250	47	60	0.8	0.76	0.21, 0.24, 0.25
Vest-Agder	450	583	150	45	1.2	0.93	0.38, 0.44, 0.46
Rogaland	2597	2735	1297	20	3.3	1	1.13, 1.31, 1.36
Hordaland	1997	1457	603	37	2.3	1	0.79, 0.91, 0.95
Sogn og Fjordane	1617	1756	625	59	2.5	0.97	0.83, 0.96, 1.00
Møre og Romsdal	1053	1880	358	94	1.2	0.89	0.37, 0.42, 0.44
Sør-Trøndelag	728	1729	187	99	1.1	0.62	0.23, 0.27, 0.28
Nord-Trøndelag	524	1737	178	98	0.6	0.67	0.14, 0.16, 0.17
Nordland	1045	1366	272	169	0.8	0.73	0.20, 0.23, 0.24
Troms	522	442	92	92	0.8	0.5	0.14, 0.16, 0.16
Finnmark	123	192	26	42	0.5	0.38	0.07, 0.08, 0.08

*In the county of Oslo no flocks had any neighbouring flocks within 1 km, hence the value was set at 0.0001.
The data are displayed for all the 19 counties in Norway. The number of sheep and cattle flocks includes the number of combined flocks. The number of isolated flocks (no other flocks within 3 km), the mean number of neighbouring flocks (sheep farms within a distance of 1 km), and the climatic rate (Cl_i /Cl_Rog ) was calculated on the basis of the geographical co-ordinates of the building of the sheep farms. The infection rate (β) was the rate of susceptible flocks becoming infected due to within county transmission.

ISSN: 1297-9716