Virus neutralization test results for 12 elk sera against 6 pestivirus strains. The y axis indicates the virus neutralization titers in log 2 scale. The x axis indicates the elk sample number: 8 ELISA-positive elk (P1 to P8) and 2 ELISA-negative elk (N1 and N2) captured in herds PH, CC, L and WH; and 2 experimentally infected elk with the BVDV strains BVDV2 24515 and BVDV1a Singer. The second row of the x axis indicate the grouping of the elk samples by origin (herd or experimental infection). For each elk sample, each bar of the graph indicates the neutralization titer for each of the 6 pestivirus strain.