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. 2018 Jul 21;181:104494. doi: 10.1016/j.prevetmed.2018.07.002

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Fig. 2 — The distribution of the estimated herd level probability of freedom (PostPFree) from BRSV antibodies (top panel) and BCV antibodies (bottom panel), by county, in the final three-month time period (time period 12) before subsequent testing. Calculations were based on BTM antibody testing, herd location and animal movement data during the period January 2013–December 2016, and were performed for n = 676 (BRSV) and n = 333 (BCV) dairy herds in two counties in western Norway during the period January 2013–December 2016. All herds had a negative test result at inclusion.