The CLSI M100 gets updated every year—but what do those changes actually mean for the microbiology lab?

In this episode of Let's Talk Micro, Luis is joined by Dr. April Bobenchik to break down the latest updates in the CLSI M100 2026 (36th edition) and how they translate into real-world lab practice.

They walk through important breakpoint changes, including aztreonam–avibactam and updates for Acinetobacter, along with new additions like trimethoprim-sulfamethoxazole breakpoints for beta-hemolytic streptococci. Another notable update this year is the updated anaerobic antibiogram and how it can be used to help guide decisions in the lab. The conversation also touches on antimicrobial tiers, why some breakpoints are temporarily removed, and practical ways labs can approach implementing new updates.

If you work in clinical microbiology, this episode will help you stay current and confident with the latest M100 changes.

Access CLSI M100 for free: https://em100.edaptivedocs.net/Login.aspx

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Luis here with a quick update! We're taking a short break and will return the week of March 23rd. During this time, it's a great opportunity to explore the archive—Let's Talk Micro has over 200 episodes covering many topics in clinical microbiology. New episodes will be back soon. Thanks for listening and for being part of the Let's Talk Micro community.

Stay connected with Let's Talk Micro:

• Website: letstalkmicro.com

• Questions or feedback? Email me at letstalkmicro@outlook.com

• Interested in being a guest on Let's Talk Micro? Fill out the form here: https://forms.gle/V2fT3asjfyusmqyi8

Support the podcast:

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Wound cultures are some of the most complex specimens encountered in the clinical microbiology laboratory. Unlike more straightforward cultures, wound specimens often contain multiple organisms, making it challenging to determine which microbes are clinically significant and which represent colonization.

In this episode of Let's Talk Micro, Luis is joined by Dr. Christopher Doern and Dr. Alexandra Bryson to discuss the wound culture guidelines from the Clinical Microbiology Procedures Handbook (CMPH) and how they can help laboratorians navigate these challenging cultures.

Together, they explore practical approaches to interpreting polymicrobial wound cultures, deciding which organisms to work up, and balancing thorough reporting with antimicrobial stewardship. The discussion also covers specimen collection challenges, the role of Gram stains in evaluating specimen quality, guidance on working up common wound pathogens, and strategies to streamline laboratory workflows.

Whether you're a student, a new microbiology technologist, or an experienced laboratorian, this episode offers practical insights to help you confidently approach wound cultures and apply CMPH guidance at the bench.

Stay connected with Let's Talk Micro:

• Website: letstalkmicro.com

• Questions or feedback? Email me at letstalkmicro@outlook.com

• Interested in being a guest on Let's Talk Micro? Fill out the form here: https://forms.gle/V2fT3asjfyusmqyi8

Support the podcast:

• Venmo

• Buy me a Ko-fi