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Blocking enzyme-linked immunosorbent assay for detection of antibodies to Actinobacillus pleuropneumoniae serotype 2.

National Veterinary Laboratory, Copenhagen, Denmark.

ABSTRACT

A blocking enzyme-linked immunosorbent assay (ELISA), based upon a polyclonal rabbit antiserum specific to Actinobacillus pleuropneumoniae serotype 2, was developed for the detection of antibodies to A. pleuropneumoniae serotype 2 in pigs. By testing sera from pigs experimentally infected with the 11 recognized serotypes of A. pleuropneumoniae, the assay was proven to be specific for A. pleuropneumoniae serotype 2. With field sera from herds infected with A. pleuropneumoniae serotype 2, the assay was found to be more sensitive than the complement fixation test. Positive results were not observed with field sera from herds known to be free from Actinobacillus infection or with sera from two herds infected with either A. pleuropneumoniae serotype 6 or 8. The high diagnostic sensitivity and specificity of the blocking ELISA will make it useful in field diagnostic work.

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