A Survey for Mycobacterium spp. in Post slaughter Matrix of Donkeys

Okoli Solomon Chieloka, Ogugua Akwoba Joseph
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Abstract

The presence of Mycobacterium in the post-slaughter matrix of animals is a public health concern. The issue is compounded during postmortem meat inspection at the abattoir when judgments on suspected cases of Tuberculosis (TB) are based solely on gross morphological lesions, without complementary laboratory tests. As a result, carcasses from animals with latent TB infection may be approved for human consumption. The aim of this study was to determine the prevalence of TB in the carcasses of donkeys slaughtered at an abattoir. A survey was conducted from January 1st, 2024 to March 31st, 2024 involving 4200 animals slaughtered within the period. Tissue samples (Lung, spleen, liver) were purposively obtained from carcasses with lesions consistent with suspected TB cases. Tissues were collected in sterile Universal bottles and transported to the laboratory in a Giostyle maintained at a temperature of 4-5 degrees Celsius. Acid-fast bacilli were identified using Ziehl-Neelsen stain. In all 26 organs obtained from individual animals that met the case definition for suspected TB, 8 (31%) tested positive for Acid-fast bacilli, the spleen accounts for 2 (25%), liver 2 (25%), and lungs 4 (50%). The prevalence of tuberculosis in the carcasses of slaughtered donkeys during this period was 0.2%. Given the absence of laboratory screening equipment and facilities to screen for suspected TB in carcasses, the risk of TB zoonosis remains high. To address this issue, we recommend the immediate establishment of dedicated tuberculosis screening facilities in all abattoirs within the state to enhance the detection and confirmation of suspected cases of tuberculosis in meat
驴屠宰后基质中的分枝杆菌调查
动物宰后基质中存在分枝杆菌是一个公共卫生问题。在屠宰场进行宰后肉类检查时,如果仅根据大体形态学病变判断是否疑似结核病(TB)病例,而不进行辅助实验室检测,则会使问题更加复杂。因此,潜伏肺结核感染动物的胴体可能获准供人类食用。本研究旨在确定在屠宰场屠宰的驴尸体中结核病的流行情况。调查从 2024 年 1 月 1 日开始,到 2024 年 3 月 31 日结束,期间共屠宰了 4200 头驴。组织样本(肺脏、脾脏、肝脏)是有目的性地从出现疑似结核病病变的胴体上采集的。组织收集在无菌通用瓶中,并用温度保持在 4-5 摄氏度的 Giostyle 运输到实验室。使用齐氏-奈尔森染色法鉴定酸性无菌杆菌。在从符合疑似结核病病例定义的动物个体身上获取的所有 26 个器官中,有 8 个(31%)的酸性粘杆菌呈阳性,其中脾脏 2 个(25%),肝脏 2 个(25%),肺脏 4 个(50%)。在此期间,屠宰驴尸体中的结核病发病率为 0.2%。由于缺乏实验室筛查设备和设施来筛查屠体中的疑似结核病,结核病人畜共患病的风险仍然很高。为解决这一问题,我们建议立即在州内所有屠宰场建立专门的结核病筛查设施,以加强对肉类结核病疑似病例的检测和确诊。
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