Department of Animal Science, Texas A&M University, 2471 TAMU, College Station, Texas 77843-2471, USA.
J Food Prot. 2012 Jun;75(6):1131-3. doi: 10.4315/0362-028X.JFP-11-530.
Lymphatic tissue, specifically lymph nodes, is commonly incorporated into ground beef products as a component of lean trimmings. Salmonella and other pathogenic bacteria have been identified in bovine lymph nodes, which may impact compliance with the Salmonella performance standards for ground beef established by the U.S. Department of Agriculture. Although Salmonella prevalence has been examined among lymph nodes between animals, no data are currently available regarding feedyard origin of the cattle and Salmonella prevalence. Bovine lymph nodes (279 superficial cervical plus 28 iliofemoral = 307) were collected from beef carcasses at a commercial beef harvest and processing plant over a 3-month period and examined for the prevalence of Salmonella. Cattle processed were from seven feedyards (A through G). Salmonella prevalence was exceptionally low (0% of samples were positive ) in cattle from feedyard A and high (88.2%) in cattle from feedyard B. Prevalence in the remaining feedyards ranged widely: 40.0% in feedyard C, 4.0% in feedyard D, 24.0% in feedyard E, 42.9% in feedyard F, and 40.0% in feedyard G. These data indicate the range of differences in Salmonella prevalence among feedyards. Such information may be useful for developing interventions to reduce or eliminate Salmonella from bovine lymph nodes, which would assist in the reduction of Salmonella in ground beef.
淋巴组织，特别是淋巴结，通常作为瘦肉切块的一部分被纳入绞碎牛肉产品中。牛的淋巴结中已经发现了沙门氏菌和其他病原菌，这可能会影响到美国农业部制定的绞碎牛肉中沙门氏菌性能标准的合规性。尽管已经检查了动物之间淋巴结中的沙门氏菌流行情况，但目前尚无关于牛的饲料场来源和沙门氏菌流行情况的数据。在商业牛肉收获和加工厂，在 3 个月的时间里，从牛肉屠体中收集了 279 个浅层颈淋巴结加 28 个股淋巴结（共 307 个），并检查了沙门氏菌的流行情况。加工的牛来自 7 个饲料场（A 至 G）。来自饲料场 A 的牛的沙门氏菌流行率极低（0%的样本呈阳性），而来自饲料场 B 的牛的流行率极高（88.2%）。其余饲料场的流行率范围很广：饲料场 C 为 40.0%，饲料场 D 为 4.0%，饲料场 E 为 24.0%，饲料场 F 为 42.9%，饲料场 G 为 40.0%。这些数据表明了饲料场之间沙门氏菌流行率的差异范围。此类信息可能有助于制定干预措施，以减少或消除牛的淋巴结中的沙门氏菌，从而有助于减少绞碎牛肉中的沙门氏菌。
