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Application of a monoclonal antibody-based enzyme-linked immunosorbent assay for detection of an inflammatory response antigen in subclinical mastitic milk samples.

Veterinary Research Laboratories, Stormont, Belfast, United Kingdom.

ABSTRACT

A monoclonal antibody to a 23.5-kDa bovine inflammatory antigen present in high levels in mastitic milk has been used in an antigen-capture enzyme-linked immunosorbent assay (ELISA) to screen milk samples from herds of cattle for subclinical mastitis. The results from 20 herds with a total of 2,612 quarter samples are presented. Good correlation was observed between the ELISA level and the milk cell count (MCC). The results demonstrated an average of 5% false negatives (1.8% associated with isolates of Staphylococcus aureus and/or Streptococcus spp.) and 7.7% false positives for each herd in relation to mastitic (greater than 400,000 cells per ml) or nonmastitic (less than 400,000 cells per ml) MCCs.

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