Fig. 1
a Geographical location of the provinces in South Korea. b Density of dairy cattle in South Korea per km2. The herds sampled in this study are mapped by a dot. c Geographical distribution patterns of the seroprevalence to BTV. Percentages of tested animals seropositive for bluetongue virus in 11 provinces in South Korea. The serotypes identified by serum neutralization tests or the BTV serotype identified by RT-PCR of blood sample are shown. Differences in the intensity of the darkness on the map represent different percentages of seroprevalence. The map depicted in figure 1 is our own