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.

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