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Etiologic Agent

The most commonly reported species from clinical sources are:

  • Nocardia nova
  • Nocardia farcinica
  • Nocardia cyriacigeorgica
  • Nocardia brasiliensis
  • Nocardia abscessus

More than 40 valid Nocardia species are considered clinically relevant.

  • Modified Kinyoun’s acid-fast stain of Nocardia cyriacigeorgica grown on sheep blood agar 5 days at 35C, 100X
  • Mixed culture on buffered charcoal yeast extract agar 5 days at 35C, 0.63X. Suspect Nocardia colonies are visible as round, white fuzzy colonies each surrounded by a halo of substrate mycelium.
  • Nocardia cyriacigeorgica colonies on sheep blood agar 5 days at 35C, 2.0X
  • Nocardia cyriacigeorgica colonies on buffered charcoal yeast extract agar 5 days at 35C, 2.0X
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