Department of Food and Feed Safety, Veterinary Research Institute, Brno, Czech Republic.
Foodborne Pathog Dis. 2013 Jun;10(6):573-6. doi: 10.1089/fpd.2012.1419. Epub 2013 Apr 24.
Nontuberculous mycobacteria (NTM) are potentially pathogenic agents commonly found in natural ecosystems, while food is considered to be another source of NTM for humans. We investigated a total of 92 tissue samples of freshwater fish and fish products: fish directly obtained from ponds (n=25), retail fresh (n=23) and frozen fish (n=23) and smoked fish products (n=21). Culture examination for the presence of mycobacteria was positive in 11 (11.9%) from all the examined samples. The 15 obtained isolates were identified as Mycobacterium fortuitum (n=5), M. immunogenum (n=2), M. phocaicum/ mucogenicum (n=1), M. neoaurum (n=2), M. peregrinum (n=2), M. porcinum (n=1) and M. senegalense/houstonense/conceptionense (n=2). NTM DNA was found in one (4.0%) sample of fresh fish from ponds and in 60.9% and 91.3% of retail fresh and frozen fish, respectively. None of the smoked fish products contained NTM DNA. The results of our study suggest that freshwater fish and fish products, especially retail frozen fish, might be a reservoir of NTM for humans, and proper handling and treatment before consumption of such products is recommended.
非结核分枝杆菌（NTM）是一种常见于自然生态系统中的潜在致病性微生物，而食物被认为是人类 NTM 的另一个来源。我们共研究了 92 份淡水鱼和鱼产品组织样本：直接从池塘中获得的鱼（n=25）、零售新鲜鱼（n=23）、冷冻鱼（n=23）和熏制鱼产品（n=21）。对所有检查样本进行分枝杆菌存在的培养检查，结果阳性的有 11 个（11.9%）。从获得的 15 个分离株中鉴定出了 5 株偶然分枝杆菌、2 株免疫分枝杆菌、1 株 phocaicum/ mucogenicum 分枝杆菌、2 株新型诺卡氏菌、2 株嗜沫分枝杆菌、1 株猪分枝杆菌和 2 株塞内加尔分枝杆菌/休斯顿分枝杆菌/康塞桑分枝杆菌。在一份来自池塘的新鲜鱼样本中发现了 NTM DNA，在零售新鲜鱼和冷冻鱼中，分别有 60.9%和 91.3%的样本中发现了 NTM DNA。熏制鱼产品中均未发现 NTM DNA。我们的研究结果表明，淡水鱼和鱼产品，尤其是零售冷冻鱼，可能是人类 NTM 的储存库，建议在食用此类产品之前进行适当的处理和治疗。
