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Table 2 Characteristics differentiating Mycobacterium marinum infection from rheumatoid arthritis flare

From: Flare or foe? - Mycobacterium marinum infection mimicking rheumatoid arthritis tenosynovitis: case report and literature review

 Favoring MM infectionFavoring RA flare
ArthritisRareFrequent
TenosynovitisRareFrequent
Skin findingsTypical swimmer’s granuloma with reddish-purplish discolourationRare presence of rheumatoid vasculitis or pyoderma gangraenosum
Laboratory findingsElevated inflammatory markers (White blood count, C-reactive protein)Leukocytosis rare
C-reactive protein in severe flares
Response to glucocorticoid therapyNo improvementUsually improves
  1. MM Mycobacterium marinum, RA rheumatoid arthritis