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Using a titer of 120 mIU/mL as the threshold of disease susceptibility [12], 542 (38.9%) and 851 (61.1%) serum samples were classified as susceptible and not susceptible, respectively (Supplementary Figure S1A). The median titers of 155 (82.2, 288), 120 (75.4, 275), and 159 (76.5,...