ArticleEuropean journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology2025
Improvement of isolation and drug testing methods for Corynebacterium spp. in clinical specimens of granulomatous mastitis.
Article in European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveThis study aimed to address the low clinical isolation rate, prolonged antimicrobial susceptibility testing (AST) time, and inconsistent results for Corynebacterium kroppenstedtii, the primary pathogens of granulomatous mastitis (GM). We optimized culture media and cultivation methods to enhance isolation efficiency and shorten AST turnaround time.
methodsAn optimized culture medium (cation-adjusted Mueller-Hinton broth CAMHB with 3.3% horse serum, β-NAD, and 1% Tween 80) combined with a sealed culture system was developed. We analyzed bacterial isolation rates and culture times using 44 GM clinical specimens. The optimized culture medium was compared with MH-F medium in microbroth dilution AST, validated against the E-test method for consistency. Antibiotic susceptibility profiles of 15 isolates to 13 agents were also assessed, including inducible resistance.
resultsThe optimized culture medium combined with sealed culture increased the isolation rate of C. kroppenstedtii to 22.72% and reduced average culture time to 36.8 h. AST time was shortened to 20 h, showing higher consistency with the E-test method (Kappa 0.916 vs. 0.744). All isolates exhibited 100% sensitivity to vancomycin and rifampicin, while 8.72% of strains showed induced resistance to penicillin and cefuroxime over time.
conclusionOptimized culture media and sealed-culture methods significantly improved isolation efficiency and enabled rapid AST within 20 h for C. kroppenstedtii, yielding more reliable results than traditional approaches
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