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Summary

Accurate phage quantification is crucial for therapy and industry. DNase treatment before qPCR reduces overestimation of infectious phage particles, improving accuracy, though storage time impacts results.

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Area of Science:

  • Microbiology
  • Molecular Biology

Background:

  • Accurate phage quantification is essential for therapeutic and industrial applications.
  • The double agar overlay (DAO) method is accurate but laborious; quantitative PCR (qPCR) is faster but overestimates phage particles.

Purpose of the Study:

  • To improve the accuracy of phage quantification using qPCR by incorporating DNase treatment.
  • To assess the impact of DNase treatment on Staphylococcus aureus phage ISP quantification.

Main Methods:

  • Phage quantification using qPCR with and without prior DNase treatment.
  • Comparison of qPCR results with the gold standard double agar overlay (DAO) method.
  • Negative contrast immune electron microscopy to detect free DNA.

Main Results:

  • DNase treatment significantly decreased phage concentration measured by qPCR.
  • Discrepancies between qPCR and DAO methods persisted for some phage stocks.
  • The accuracy of qPCR quantification was influenced by the storage period of the phage stock, with older stocks showing greater discrepancies.

Conclusions:

  • DNase treatment enhances the accuracy of qPCR for quantifying infectious phage particles.
  • Storage duration affects the reliability of qPCR phage quantification.
  • Further optimization is needed to fully align qPCR with DAO method accuracy for all phage stocks.