A cross-sectional study on fecal shedding of Salmonella among cow-calf herds in the southeastern United States

Cross-sectional surveys are important in identifying emerging and re-emerging pathogens. Although cattle are notable reservoirs of Salmonella, few studies have reported the isolation of the emerging atypical H2S-negative strain of the pathogen from bovine sources. These atypical strains can cause disease outbreaks yet easily elude detection. This study investigates the antimicrobial resistance profiles and epidemiology of Salmonella among cow-calf herds in Alabama, U.S., while attempting to isolate its emerging H2S-negative variant.

横断面调查（Cross-sectional surveys）在识别新发与再现病原体方面具有重要意义。尽管牛是沙门氏菌（Salmonella）的重要储存宿主，但目前鲜有研究从牛源中分离出该病原体新发的非典型硫化氢阴性菌株。此类非典型菌株可引发疾病暴发，却极易逃脱检测。本研究针对美国阿拉巴马州的母牛-犊牛群开展沙门氏菌相关调查，旨在解析其抗菌药物耐药谱与流行病学特征，同时尝试分离该菌新发的硫化氢阴性变异株。