Answer to case 1: Nocardia

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 Pic1: Staining: Modified Z-N Staining using 1% sulfuric acid decolorizer.

Green arrow: Pink filamentous bacteria. Red arrow: Pus cells.

Pic 2: Gram staining.

White arrow: Pus cells. Yellow arrow: gram positive filamentous bacteria.


Actinomyces and Nocardia both are gram positive filamentous bacteria but Nocardia is weak acid fast.

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  1. AnonymousApril 23, 2021 at 10:39 AM

    Pic1-Ziehl Neelsen staining using 1% sulphuric acid as decolorizer showing thin, filamentous, branching partially acid fast bacteria in a background of many polymorphic nuclear leukocytes suggestive of Nocardia
    Nocardia is a gram positive bacteria

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