Antibiotic Resistance and UTI Treatment: Dr. Nicholas Sanford


July 29, 2026

In part two of this clinical interview, Dr. Nicholas Sanford from MicroGenDX discusses advanced molecular diagnostic methods for urinary tract infections, focusing on antibiotic resistance detection and Next-Generation Sequencing (NGS). He clarifies the distinction between PCR-based resistance gene detection, which rules out ineffective treatments, and traditional culture-based susceptibility testing. Dr. Sanford explains the complexities of polymicrobial infections, semi-quantitative bacterial load measurements, and the dynamic nature of the urinary microbiome. He also addresses clinical utility, insurance coverage, and practical aspects of testing, emphasizing a "test-treat-retest" approach for persistent or chronic UTIs to achieve long-term resolution.

Key Take Aways

Antibiotic Resistance Testing Differences


PCR resistance gene detection rules out ineffective treatments without requiring positive culture growth.

Prevalence of Polymicrobial Infections


Molecular diagnostics reveal that most persistent urinary tract infections involve multiple microbial species.

Rapid Diagnostic Turnaround Times


Level one PCR results arrive within 24 hours while full sequencing takes several days.

Dynamic Urinary Microbiome Changes


Bladder microbial communities change constantly over time in response to diet, age, and environment.

Test Treat Retest Approach


Sequential testing helps identify emerging secondary organisms as dominant bacterial layers are cleared.

Filtering Non Viable DNA


Strict bioinformatic thresholds ensure reported sequencing reads represent active organisms rather than dead cellular debris.
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Mellisa Kramer

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Founder, Live UTI Free

Melissa began interviewing experts after her own struggle with recurrent UTIs. She now works with a network of clinicians, researchers, and women’s health advocates to improve awareness, testing, and treatment options for chronic UTI.

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