Let's Talk Micro

Luis Plaza

Clinical microbiology explained in simple terms, suitable for students and microbiologists alike. We discuss organisms, reactions, infectious diseases, and more. Hosted by Luis Plaza, a Medical Laboratory Scientist and microbiologist, who also shares his experiences in the field.

  1. 2 小時前

    250: Metallo-β-Lactamases: The Rise of NDM and Beyond

    Metallo-β-lactamases (MBLs) have become an increasingly important topic in clinical microbiology and infectious diseases. While these enzymes were once encountered relatively infrequently in the United States, their epidemiology is changing, with NDM-producing organisms becoming more common. What makes metallo-β-lactamases different from other carbapenemases? Why are infections caused by MBL-producing organisms particularly challenging to treat? And what new treatment options are becoming available? In this episode of Let's Talk Micro, Luis is joined by Dr. Ryan Shields and Dr. Emily Heil to discuss metallo-β-lactamases and their growing clinical significance. They explore the differences between serine β-lactamases and MBLs, review important enzymes such as NDM, VIM, and IMP, and discuss the challenges associated with treating infections caused by MBL-producing organisms. The conversation also covers emerging treatment options, including aztreonam-avibactam and cefepime-zidebactam, and highlights the importance of identifying specific carbapenemases to guide antimicrobial therapy. Join us for a discussion on the evolving landscape of metallo-β-lactamases and the essential role of the clinical microbiology laboratory in patient care. Guests: Ryan Shields, PharmD — University of Pittsburgh Emily Heil, PharmD — University of Maryland School of Pharmacy and University of Maryland Medical Center Additional Reading: McCreary EK, Heil EL, Aitken SL, et al. The global epidemiology and treatment of metallo-β-lactamase-producing gram-negative pathogens. JAC-Antimicrobial Resistance. 2026;8(5). https://pubmed.ncbi.nlm.nih.gov/42876900/ 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

  2. 10月15日

    248: Micro Minutes: What's in a name- Bacterial Groups and Complexes

    Have you ever performed an organism identification using MALDI-TOF mass spectrometry and received a result showing multiple possible species, such as Enterobacter cloacae and Enterobacter asburiae, or Citrobacter freundii and Citrobacter werkmanii? Why does this happen? What do these organisms have in common, and why are they classified into groups or complexes? In this episode of Micro Minutes, Luis explores bacterial groups and species complexes, why they exist, and how they relate to organism identification. He discusses several familiar and lesser-known examples, including the Enterobacter cloacae complex, Acinetobacter calcoaceticus–baumannii complex, Klebsiella pneumoniae species complex, Citrobacter freundii complex, and Pseudomonas putida group. The episode also highlights the Burkholderia cepacia complex and why species-level identification can be particularly important in patients with cystic fibrosis. Finally, learn why reporting an organism at the group or complex level is often appropriate, when additional identification may be necessary, and why understanding the capabilities and limitations of your identification system matters. 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

  3. 10月1日

    246: Inside ATCC: From Biological Materials to the Bench

    Many microbiology professionals are familiar with ATCC strains used for quality control, validation, and verification—but what happens before those biological materials reach the laboratory? ATCC, the American Type Culture Collection, maintains biological materials used by scientists and laboratories around the world. In this episode of Let's Talk Micro, Luis is joined by Dr. Shahin Ali, Senior Scientist at ATCC, to take a closer look at the work behind biological reference materials. Dr. Ali discusses how ATCC identifies and acquires microorganisms, what characteristics are considered when adding them to the collection, and how materials are authenticated, characterized, preserved, and maintained over time. The conversation also explores expert curation and complete provenance, why authenticated reference materials are important for laboratory quality and reproducibility, and how individual strains of the same species can have meaningful differences. Luis and Dr. Ali also discuss antimicrobial resistance, the growing importance of genomic and metadata quality, and how curated biological collections may support AI-driven research in the future. And, as always, stay until the end to hear Dr. Ali's favorite microorganism—and the personal connection behind his answer. Resources Learn more about ATCC: https://www.atcc.org/ 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

  4. 9月28日

    World Rabies Day: Revisiting Rabies with Dr. Rodney Rohde

    Originally published on September 28, 2022, this episode returns to the Let's Talk Micro feed in recognition of World Rabies Day. Dr. Rodney Rohde joins the podcast to discuss rabies and his extensive experience working with the virus in public health. We start with the basics: What is rabies? How is it transmitted? What are the signs and symptoms? From there, we discuss potential exposures, post-exposure prophylaxis, vaccination, and ways to prevent rabies. Dr. Rohde also shares his experience working in rabies diagnostics and molecular epidemiology, as well as his involvement with wildlife rabies vaccination efforts. We also discuss the importance of recognizing potential exposures, the role of wildlife—particularly bats—and considerations when traveling to areas where rabies may be more prevalent. Finally, what is World Rabies Day, and why is it observed on September 28? Dr. Rohde discusses the history and significance of the day and the importance of education, prevention, and collaboration in the fight against rabies. Tune in as we revisit this conversation and learn more about rabies. Resources World Rabies Day: https://rabiesalliance.org/world-rabies-day Dr. Rohde's rabies book: https://www.elsevier.com/books/rabies/wilson/978-0-323-63979-8 Dr. Rohde's website: https://rodneyerohde.wp.txstate.edu/ Related publication: https://pubmed.ncbi.nlm.nih.gov/33659941/ 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

  5. 9月17日

    244: Group A Strep: Breaking Down the New IDSA Guidelines

    Group A Streptococcus (GAS) is a common cause of pharyngitis, but deciding who should be tested and which testing method to use isn't always straightforward. In 2025, the Infectious Diseases Society of America (IDSA) released updated guidelines on Group A streptococcal pharyngitis, bringing renewed attention to diagnostic stewardship and the use of clinical scoring systems to help guide testing decisions. In this episode of Let's Talk Micro, Dr. Christopher Doern returns to the podcast to break down the updated IDSA guidelines and what they may mean for clinical practice. We discuss clinical scoring systems such as Centor and McIsaac, antigen testing, culture, molecular diagnostics, and point-of-care testing. We also explore turnaround time and cost considerations, GAS carriage and the interpretation of positive results, and how diagnostic decisions connect with antimicrobial stewardship. Tune in as we take a practical look at what's changing in Group A strep testing and how laboratories and clinicians can approach these updated recommendations. This podcast episode is sponsored by Cepheid. The views and opinions expressed by the interviewer in this interview are their own and do not necessarily reflect the position of Cepheid. Resources IDSA Clinical Practice Guideline Update on Group A Streptococcal (GAS) Pharyngitis: IDSA 2025 Group A Streptococcal Pharyngitis Guideline Current Laboratory and Point-of-Care Pharyngitis Diagnostic Testing and Knowledge Gaps: https://pubmed.ncbi.nlm.nih.gov/39688598/ 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

簡介

Clinical microbiology explained in simple terms, suitable for students and microbiologists alike. We discuss organisms, reactions, infectious diseases, and more. Hosted by Luis Plaza, a Medical Laboratory Scientist and microbiologist, who also shares his experiences in the field.

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