From: Mapping geographical areas at risk for tick-borne encephalitis (TBE) by analysing bulk tank milk from Swedish dairy cattle herds for the presence of TBE virus–specific antibodies
S/P % values
Number of bulk tank milk samples/herds
May
November
< 12
570
490
12–19
28
43
≥ 20
18
27
Total number of herds
616
560