Pus (exudate) is a collection of white blood cells, dead tissue, and bacteria. In a Gram stain, the pus is smeared on a slide and treated with specific dyes. A microbiologist then identifies the bacteria based on their color and shape:
- Gram-Positive (Purple): Bacteria with thick cell walls.
- Gram-Negative (Pink/Red): Bacteria with thinner, complex cell walls.
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