Two aborted Chester White pig fetuses were presented to a veterinary diagnostic laboratory in Illinois. Postmortem examination identified no gross abnormalities. Histologic evaluation revealed multifocal necrosis of chorionic epithelial cells, coalescing areas of mineralization in the placenta, and focal accumulations of viable and degenerate neutrophils in the lung. Intra- and extracellular acid-fast bacilli were identified in the lesions in both the placenta and lungs. Bacterial culture of stomach contents yielded heavy growth of Mycobacterium fortuitum, a rapidly growing nontuberculous mycobacterium (NTM), which was further confirmed through whole-genome sequencing. NTM are opportunistic pathogens commonly found in the soil and in contaminated water supplies. In animals, M. fortuitum is typically introduced through cutaneous wounds leading to infections limited to the skin, with systemic infection being uncommon. To our knowledge, abortion caused by M. fortuitum has not been reported previously.

两个流产的切斯特白猪胎儿被送到伊利诺伊州的兽医诊断实验室。尸检未发现明显异常。组织学评估显示绒毛膜上皮细胞多灶性坏死，胎盘矿化区域合并，肺内有活的和退化的中性粒细胞聚集。在胎盘和肺的病变中均发现了细胞内和细胞外的抗酸杆菌。胃内容物的细菌培养产生了偶然分枝杆菌的大量生长，这是一种快速生长的非结核分枝杆菌 (NTM)，通过全基因组测序进一步证实了这一点。NTM 是常见于土壤和受污染水源中的机会性病原体。在动物中，M. fortutum通常通过皮肤伤口引入，导致仅限于皮肤的感染，全身感染并不常见。据我们所知，由偶然分枝杆菌引起的流产以前没有报道过。