212: Micro Minutes: Sometimes MacConkey Lies

from Let's Talk Micro · host Luis Plaza

Welcome to the very first Micro Minutes, a new quick-hit series from Let's Talk Micro designed for students, techs, and anyone who wants fast, practical microbiology insights in under 10 minutes. In this episode, we tackle a common misconception that microbiologists can make at the bench when interpreting a single plate: MacConkey agar. Many assume: "If it doesn't grow on MacConkey, it's not a gram-negative rod." "If it does grow on MacConkey, it must be a gram-negative rod." Both are wrong — and today we break down why. Stay connected with Let's Talk Micro: Website: letstalkmicro.com Questions or feedback? Email me at [email protected] 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

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This episode was published on November 7, 2025.

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