Detection of PCR amplicons from bacterial pathogens using microsphere agglutination

Shaw Jye Wu, Alex Chan, Clarence I. Kado

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


For rapid and inexpensive detection of polymerase chain reaction (PCR) amplicons, a novel microsphere agglutination assay has been developed. PCR is carried out using biotinylated forward and reverse primers, and the amplified DNA fragments are able to agglutinate streptavidin-coated microspheres (5.7 μm in diameter). Purification of PCR amplicons is unnecessary when initial primer concentrations are 250 nM. Agglutination can be identified visually within 2 min without any additional equipment or reagents. Using listeriolysin (lisA)-specific biotinylated primers, we have successfully detected and identified Listeria monocytogenes lisA+ cells among Salmonella typhimurium, Staphylococcus aureus, Campylobacter jejuni and Escherichia coli O157:H7 cells. The simplicity of this protocol considerably reduces the time and cost of diagnostic PCR experiments. This procedure is potentially useful for various studies and field applications.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalJournal of Microbiological Methods
Issue number3
StatePublished - Mar 2004


  • Bacterial pathogens
  • Detection
  • Microsphere agglutination
  • PCR amplicons


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