Multiplex PCR for identification of six clinically relevant streptococci

Area of Science:

• Microbiology
• Molecular Biology
• Clinical Diagnostics

Background:

• Streptococcal species are significant human pathogens.
• Accurate and rapid identification of streptococci is crucial for effective treatment and infection control.

Purpose of the Study:

• To develop a multiplex PCR (mPCR) assay for the simultaneous detection of six clinically relevant streptococcal species.
• To evaluate the mPCR assay's performance against conventional methods.

Main Methods:

• Developed an mPCR using species-specific primers for Streptococcus pneumoniae, Streptococcus suis, Streptococcus gallolyticus subsp. gallolyticus, S. gallolyticus subsp. pasteurianus, Streptococcus intermedius, and Streptococcus anginosus/constellatus.
• Tested the mPCR with 37 reference strains and 442 clinical isolates.
• Compared mPCR results with API 20 Strep and biochemical tests.

Main Results:

• The mPCR produced distinct amplification products for each of the six target streptococcal species.
• No cross-reactivity was observed with other bacterial species.
• mPCR results for clinical isolates aligned with those from API 20 Strep and biochemical tests.

Conclusions:

• The developed mPCR is a rapid, simple, and reliable method for identifying pure cultures of these six streptococci at the species level.
• This assay is valuable for laboratory diagnostics and surveillance of human infections caused by these bacteria.