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Comparison of the distribution of serum neutralization and ELISA antibody titers in piglets with or without diarrhea in farms SL (a,b) and RS (c,d). Each point represents one litter and sera were collected from 2 piglets 2 days after birth from each sow. For the SL farm, n = 9 and 7 for litters with or without diarrhea, respectively, and for the RS farm, n = 10 and 5 for litters with or without diarrhea, respectively.
