TABLE 1.

Serological examination of 1,550 fox sera for E. phagocytophila and E. canis by IFA

Sample origin (region of Switzerland)	E. phagocytophila		No. reactiveb for E. canis
	No. reactivea/total (%)	IFA titers (no. of samples)
North	21/562 (3.7)	40 (7), 80 (6), 160 (4), 320 (3), 640 (1)	0
Central	3/269 (1.1)	40 (2), 160 (1)	0
South	2/108 (1.8)	80 (1), 160 (1)	0
East	3/207 (1.4)	40 (1), 80 (1), 160 (1)	0
West	15/404 (3.7)	40 (7), 80 (8)	0
Total	44/1,550 (2.8)		0

^aIFA titer of ≥40. 

^bIFA titer of ≥20.