Differential diagnosis: Bacterial-Bartonella, Erysipelothrix, Tularemia, Norcardia, Bacillus anthracis, Rhodococcus, Yersinia. Mycobacterial-Mycobacterium tuberculosis and nontuberculosis mycobacteria. Fungal-Sporothrix, Coccidioides, Blastomyces, Histoplasma, Cryptococcus, Filamentous fungi. Viral-Parapoxvirus, Orthopoxvirus.
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