Gram stain
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You are here: Home » Microbiology Notes » Gram stain
most useful test in the clinical microbiology laboratory
developed in the 19th century by Hans Gram
gives us shape and color
Gram-positive: purple
Gram-negative: red
this allows you to presumptively diagnose a patient’s infection directly from a clinical specimen without having to do a culture or PCR. Gram stain takes minutes, not hours (PCR) or days (culture)
Category: Microbiology Notes
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