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. 2026 Apr 9;17:1805920. doi: 10.3389/fphar.2026.1805920

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Copyright © 2026 Liu, Wang, Li and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Panel A shows Gram stain of abscess fluid revealing filamentous, branching Gram-positive rods with irregular beading. Panel B displays dry, chalky colonies with aerial hyphae on blood agar, characteristic of Nocardia farcinica. — Microbiological identification of Nocardia farcinica. (A) Gram stain of abscess fluid (×1000, oil immersion) showing filamentous, branching Gram-positive rods with irregular beading (arrows). (B) Colony morphology on blood agar after 72 h at 35 °C demonstrating dry, chalky colonies with aerial hyphae, characteristic of N. farcinica.