City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region of China.
Chattogram Veterinary and Animal Sciences University, Zakir Hossain Rd, Khulshi, Chattogram 4202, Bangladesh; Charles Sturt University, Boorooma Street, North Wagga, Wagga Wagga, NSW, Australia.
Prev Vet Med. 2024 Oct;231:106302. doi: 10.1016/j.prevetmed.2024.106302. Epub 2024 Aug 3.
The prevalence of avian influenza viruses is commonly found to increase dramatically as birds are transported from farms to live bird markets. Viral transmission dynamics along marketing chains are, however, poorly understood. To address this gap, we implemented a controlled field experiment altering chicken supply to a live bird market in Chattogram, Bangladesh. Broilers and backyard chickens traded along altered (intervention) and conventional (control) marketing chains were tested for avian influenza viruses at different time points. Upon arrival at the live bird market, the odds of detecting avian influenza viruses did not differ between control and intervention groups. However, 12 h later, intervention group odds were lower, particularly for broilers, indicating that viral shedding in live bird markets resulted partly from infections occurring during transport and trade. Curtailing avian influenza virus prevalence in live bird markets requires mitigating risk in marketing chain nodes preceding chickens' delivery at live bird markets.
禽流感病毒的流行率通常会随着禽类从农场运输到活禽市场而急剧增加。然而，沿销售链的病毒传播动态还不太清楚。为了解决这一差距，我们在孟加拉国的 Chattogram 实施了一项控制现场实验，改变了活禽市场的鸡只供应。在不同时间点，对沿改变后的（干预）和传统的（对照）销售链交易的肉鸡和后院鸡进行了禽流感病毒检测。到达活禽市场时，对照组和干预组检测到禽流感病毒的几率没有差异。然而，12 小时后，干预组的几率较低，特别是对肉鸡而言，这表明活禽市场中的病毒脱落部分是由于运输和贸易过程中发生的感染所致。减少活禽市场中的禽流感病毒流行率需要减轻在鸡只送到活禽市场之前的销售链节点的风险。
