Climate and environmental change drives Ixodes ricinus geographical expansion at the northern range margin

Parasites & Vectors

Table 2 Changes in the prevalence of antibodies against A. phagocytophilum in sheep and farms

District	Timespan	Farms tested (n)	Sheep tested (n)	Positive sheep (n)	Proportion positive sheep [95%CI]*	Mean farm prevalence [90% range]
INLAND	1	6	379	139	0.37 [0.32-0.42]	0.33 [0.18 – 0.46]
	2	0	0	n.a	n.a	n.a
	3	16	436	124	0.28 [0.24-0.33]	0.26 [0.06 – 0.52]
COAST	1	12	520	252	0.48 [0.44-0.53]	0.59 [0.34 – 0.92]
	2	20	403	117	0.29 [0.26-0.35]	0.39 [0.00 – 1.00]
	3	12	339	210	0.62 [0.57-0.67]	0.61 [0.13 – 1.00]
FJORD	1	6	240	151	0.63 [0.56-0.69]	0.72 [0.14 – 1.00]
	2	9	326	249	0.76 [0.71-0.81]	0.78 [0.47 – 1.00]
	3	11	320	301	0.94 [0.91-0.96]	0.94 [0.80 – 1.00]

In the 3 study regions during three different timespans: timespan 1; 1978–1989, timespan 2; 1990 – 1999; timespan 3: 2000–2008. *Confidence intervals obtained from assuming that the positive sheep are independent and following a binomial probability distribution.

ISSN: 1756-3305