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. 2013 May 15;8(5):e62259. doi: 10.1371/journal.pone.0062259

Figure 2. Individual Hemagglutinin Inhibition Assay serologic results over time showing positive titers that ranged from 1∶80 to 1∶1280, but varied by animal group in 2010 to 2011.

Figure 2

The line represents the cut-off value for seropositive samples of titers ≥40.