Microbiology – MCQ 11 – A person working in an abattoir presented with a papule on hand, which turned into an ulcer.

A person working in an abattoir presented with a papule on hand, which turned into an ulcer. Which will best help in diagnosis?
A. Trichrome Methylene Blue
B. Carbol Fuschin
C. Acid Fast Stain
D. Calcoflour White

Correct answer : A. Trichrome Methylene Blue

The clinical features are suggestive of cutaneous anthrax. Trichrome methylene blue is used to demonstrate McFadyean’s reaction which is characteristic of Bacillus anthracis.

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