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1 Department of Veterinary Science, The University of Melbourne, Parkville, Victoria 3010, Australia
To improve diagnosis of mastitis in dairy cattle, a multiplex polymerase chain reaction (PCR) assay was developed for the simultaneous detection of the four major bacterial causes of bovine mastitis, Staphylococcus aureus, Streptococcus agalactiae, Streptococcus dysgalactiae, andStreptococcus uberis. The target sequence was the 16S to 23S rRNA spacer regions. The performance of the assay was examined with 117 milk samples collected from a subclinically infected herd, and the diagnostic specificities and sensitivities of the multiplex PCR were compared with conventional culture. PCR was significantly more sensitive than culture for detection of S. aureus and S. uberis, but there were no significant differences in sensitivities between PCR and culture for the detection of S. agalactiae and S. dysgalactiae. The results suggest that this multiplex PCR assay could be used as an alternative method in routine diagnosis for rapid, sensitive, and specific simultaneous detection of S. aureus, S. agalactiae, S. dysgalactiae, and S. uberis in milk samples.
Key Words: multiplex • PCR • diagnosis • mastitis
Submitted on September 12, 2000
Accepted on December 29, 2000
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