| [serological study of the presence of actinobacillus pleuropneumoniae antibodies serotype 2 and 9 on pig-breeding farms in the provinces of north brabant and overijssel (the netherlands)]. | serological studies for the presence of cft antibodies to actinobacillus pleuropneumoniae, both to serotype 2 and serotype 9, were done in twenty-five sows on each of thirty pig-breeding farms in the provinces of north brabant and overijssel. antibodies to serotype 2 and/or serotype 9 were detected in one or several sows on forty-two out of sixty farms. similar findings were recorded on eighteen and twenty-four farms respectively in the provinces of overijssel and north brabant; the number of he ... | 1990 | 2326781 |