Figure 2. . . Frequency distribution of the results yielded by indirect ELISA for detecting IgG targeting recombinant nucleoprotein of the emerging Schmallenberg virus in serum samples from 519 cows, Belgium, 2012. Results are expressed as percentages of the reference signal yielded by the kit positive control serum, with serologic status defined as negative (<60%), doubtful (>60% and <70%), or positive (>70%) by the manufacturer.
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