Proof of concept of a method that assesses the spread of microbial infections with spatially explicit and non-spatially explicit data

Table 2 Cumulative and annual EP spatial spread

EP ID (n = 16)	Farms reporting EP (farm ID)	Cumulative distance over 18 years (EPdist, km)	Years (between first and last isolation)	Annual spread velocity between first and last isolation (EPspeed, km/year) [C/D]
A	B	C	D	E
15	7 to 9, to 2, to 13+22, to 1+3	965.46	9	107.27
79	2 to 3, to 1+4	208.01	2	104.01
7	10 to 1, to 3	389.58	4	97.40
16	13 to 1, to 18	335.03	4	83.76
37	2 to 3, to 1	175.58	3	58.53
10	1 to 3+7, to 9, to 4, to 2	643.87	12	53.65
62	22 to 3, to 7	203.23	5	40.65
29	1+2+7, to 3, to 12, to 5, to 8, to 6 +22, to 21, to 17, to 4	682.27	17	40.13
46	3 to 2, to 6	145.84	4	36.46
30	2 to 7, to 1, to 4	517.71	17	30.46
13	2 to 3+6, to 7	117.95	6	19.66
38	7 to 20, to 8, to 2, to 3	194.35	17	11.43
63	14 to 3	69.50	7	9.93
17	3 +5 to 1	104.87	11	9.53
26	2 to 1	37.36	4	9.34
31	1 to 2+3, to 6	113.63	14	8.11
Median		198.79	6.5	38.30

A: Farm identifiers.
B: Estimated route of EP dissemination, based on farm location (as reported in Table 1)
C: EP spatial spread (km) over the entire length of the study period (18 years), or EPdist
D: Time (years) between earliest and latest EP isolation
E: EP spread velocity (km/year), or EPspeed

ISSN: 1476-072X