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美国食用动物弓形虫感染率的系统荟萃分析

A Systematic Meta-Analysis of Toxoplasma gondii Prevalence in Food Animals in the United States.

作者信息

Guo Miao, Mishra Abhinav, Buchanan Robert L, Dubey Jitender P, Hill Dolores E, Gamble H Ray, Jones Jeffrey L, Pradhan Abani K

机构信息

1 Department of Nutrition and Food Science, University of Maryland , College Park, Maryland.

2 Center for Food Safety and Security Systems, University of Maryland , College Park, Maryland.

出版信息

Foodborne Pathog Dis. 2016 Mar;13(3):109-18. doi: 10.1089/fpd.2015.2070. Epub 2016 Feb 8.

Abstract

Toxoplasma gondii is a widely distributed protozoan parasite. The Centers for Disease Control and Prevention reported that T. gondii is one of three pathogens (along with Salmonella and Listeria), that together account for >70% of all deaths due to foodborne illness in the United States. Food animals are reservoirs for T. gondii and act as one of the sources for parasite transmission to humans. Based on limited population-based data, the Food and Agriculture Organization/World Health Organization estimated that approximately 22% of human T. gondii infections are meatborne. The objective of the current study was to conduct a systematic meta-analysis to provide a precise estimation of T. gondii infection prevalence in food animals produced in the United States. Four databases were searched to collect eligible studies. Prevalence was estimated in six animal categories (confinement-raised market pigs, confinement-raised sows, non-confinement-raised pigs, lamb, goats, and non-confinement-raised chickens) by a quality-effects model. A wide variation in prevalence was observed in each animal category. Animals raised outdoors or that have outdoor access had a higher prevalence as compared with animals raised indoors. T. gondii prevalence in non-confinement-raised pigs ranked the highest (31.0%) followed by goats (30.7%), non-confinement-raised chickens (24.1%), lambs (22.0%), confinement-raised sows (16.7%), and confinement-raised market pigs (5.6%). These results indicate that T. gondii-infected animals are a food safety concern. The computed prevalence can be used as an important input in quantitative microbial risk assessment models to further predict public health burden.

摘要

刚地弓形虫是一种广泛分布的原生动物寄生虫。疾病控制与预防中心报告称,刚地弓形虫是三种病原体之一(与沙门氏菌和李斯特菌一起),这三种病原体共同导致了美国超过70%的食源性疾病死亡。食用动物是刚地弓形虫的宿主,也是寄生虫传播给人类的来源之一。根据有限的基于人群的数据,粮食及农业组织/世界卫生组织估计,大约22%的人类刚地弓形虫感染是通过肉类传播的。本研究的目的是进行系统的荟萃分析,以精确估计美国生产的食用动物中刚地弓形虫的感染率。搜索了四个数据库以收集符合条件的研究。通过质量效应模型估计了六个动物类别(圈养的商品猪、圈养的母猪、非圈养的猪、羔羊、山羊和非圈养的鸡)的感染率。在每个动物类别中观察到感染率有很大差异。与室内饲养的动物相比,户外饲养或有户外活动机会的动物感染率更高。非圈养猪的刚地弓形虫感染率最高(31.0%),其次是山羊(30.7%)、非圈养鸡(24.1%)、羔羊(22.0%)、圈养母猪(16.7%)和圈养商品猪(5.6%)。这些结果表明,感染刚地弓形虫的动物存在食品安全问题。计算出的感染率可作为定量微生物风险评估模型的重要输入,以进一步预测公共卫生负担。

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