Read the stain
Microbiology - Image Library
Gram stains, special stains and culture plates annotated to identify the organism and guide treatment.
- Stain + morphology
- Annotated
- Bug to drug
- Treatment-linked
What's inside the Microbiology library
The microbiology library moves from stain to organism to therapy - Gram reaction, shape and arrangement first - so identification drives the antibiotic choice.
Gram stain
Gram-positive organisms stain purple, Gram-negative pink. Cocci in clusters suggest Staphylococcus; cocci in chains suggest Streptococcus; Gram-negative rods suggest Enterobacterales. Shape and arrangement narrow the organism before the culture is back.
Acid-fast bacilli
On Ziehl-Neelsen staining, acid-fast bacilli appear as red rods against a blue background, identifying Mycobacterium tuberculosis. A positive smear changes isolation and notification, not just the prescription.
Interpret the image with the specimen and method
Start by naming the specimen, preparation and stain or culture method, because the same shape has different meaning in a direct smear, colony plate and tissue section. Describe arrangement, size, staining behaviour and surrounding cells before identifying an organism. Then consider contamination, colonisation, mixed growth and test limitations. A representative teaching field cannot establish susceptibility or prove causation. Link visual recognition to specimen quality, clinical syndrome and confirmatory testing so that a memorable image becomes a safe laboratory interpretation habit rather than an isolated label.
Work through the full Microbiology library in MedNext
Every image is annotated the same way, mapped to high-yield exam topics and linked to its chapter.
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