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Percent frequency distribution of pigs with positive results in ELISA following natural exposure to FMDV. Vesicular lesions were observed first in 7-week-old nursery pigs on one pig farm 5 days before the first bleeding (designated week 1 postoutbreak). Eight to 10 sera were collected from pigs in the same pen with the first case. Shaded bars, percentage of pigs with ODp values of ≤75 (test positive); solid circles, means ± SD of ODp values.
