Three genera cause most of the Gram-positive infections a nurse will meet. They all hold the violet crystal-violet stain, but each has its own shape, its own lab test, and its own set of diseases. Tap a genus, then flip between its traits, diseases, and nursing points.
Staphylococcus
cocci in clusters
Gram stain, 1000× oil-immersion field · Gram-positive cells retain crystal violet and appear purple