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Kinetics of neutralizing antibodies against FMDV O1 Campos in trial 1 (A) and trial 2 (B). Serum samples were collected 0, 4, 7, and 14 dpv, on challenge day (0 dpc), and 2, 4, 7, 14, and 21 dpc. Titers are expressed as the inverse dilution of serum yielding a 50% reduction in TCID50. Values represent means ± standard deviations.
