| [serologic studies on the presence of antibodies against haemophilus (actinobacillus) pleuropneumoniae at swine breeding farms in north brabant]. | serological screening for the presence of antibodies to both h. pleuropneumoniae serotype 2 and serotype 9 using the complement fixation test was carried out on twenty-nine piglets production farms of an integrated group in the province of north brabant. antibodies to h. pleuropneumoniae serotype 2 and serotype 9 were not detected on six of the twenty-nine farms when a single screening was performed. the proportions of farms with animals serologically positive in regard to serotypes 2 and 9 were ... | 1989 | 2734766 |