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Our objective was to identify pigs of an endemically infected herd that were susceptible to pleuropneumonia due to Actinobacillus pleuropneumoniae. The presence of toxin-neutralizing antibodies was studied in serum of 36 pigs from birth until 24 weeks of age. Titers gradually declined during the first twelve weeks of life and increased thereafter. Sera from one-hundred 3-weeks-old piglets and one-hundred...