Figure 3From: Transmission of border disease virus from a persistently infected calf to seronegative heifers in early pregnancy Mean relative OD of the pestivirus antibody ELISA for heifers with a persistently infected fetus and heifers with a normal fetus. Mean relative OD of the pestivirus antibody ELISA and 95% confidence intervals for 3 heifers with a persistently infected fetus (▲) and 3 heifers with a normal fetus (●). * P ≤0.05.Back to article page