MICROBIOLOGY
Gram Stain Flowchart for Differentiating Bacterial Cultures
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CASE ANALYSIS
Scenario
A laboratory technician follows a standardized Gram staining procedure to classify an unknown bacterial isolate based on cell wall properties and microscopic morphology.
Key decisions
- Purple vs pink/red color after staining
- Cocci clusters vs chains vs bacilli for Gram-positive organisms
- Cocci vs bacilli vs coccobacilli for Gram-negative organisms
When to reuse this
Use when teaching or executing the Gram stain protocol to presumptively identify bacterial groups from a pure culture.
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