埃塞俄比亚西南部吉马地区 backyard 和商业鸡群中传染性支气管炎病毒和禽偏肺病毒的分子流行病学与基因分型

Molecular Epidemiology and Genotyping of Infectious Bronchitis Virus and Avian Metapneumovirus in Backyard and Commercial Chickens in Jimma Zone, Southwestern Ethiopia.

作者信息

Tegegne Dechassa, Deneke Yosef, Sori Takele, Abdurahaman Mukarim, Kebede Nigatu, Cecchinato Mattia, Franzo Giovanni

机构信息

School of Veterinary Medicine, Jimma University College of Agriculture and Veterinary Medicine, P.O. Box 307 Jimma, Ethiopia.

Aklilu Lemma Institute of Pathobiology, Addis Ababa University, P.O. Box 1176 Addis Ababa, Ethiopia.

出版信息

Vet Sci. 2020 Nov 25;7(4):187. doi: 10.3390/vetsci7040187.

Abstract

Poultry production plays a relevant role in the Ethiopian economy and represents a source of poverty alleviation for several social classes. Infectious diseases can therefore significantly impact the economy and welfare. Despite infectious bronchitis virus (IBV) and avian metapneumovirus (aMPV) being present, the knowledge of their epidemiology and impact is extremely limited. In the present work, a cross-sectional study based on 500 tracheal swabs collected from 50 intensive and backyard unvaccinated flocks of the Jimma Zone was performed to investigate the circulation of these viruses and molecularly characterize them. IBV and aMPV presence was tested by molecular assays, and genotyping was carried out on positive samples. Accordingly, 6% (95% CI 2.06% to 16.22%) and 8% (95% CI 3.15% to 18.84%) of flocks tested IBV and aMPV positive, respectively. Particularly, IBV 793B (GI-13) strains were detected in backyard flocks only, and identical or closely related sequences (-distance <2%) were detected in distantly spaced flocks, suggesting relevant viral circulation. On the contrary, both backyard and intensive flocks were affected by aMPV subtype B. Potential epidemiological links associated to the importation of parental birds from foreign countries could be established. These results highlight non-negligible circulation of these viruses, warranting further epidemiological studies and the evaluation of control measure implementation.

摘要

家禽生产在埃塞俄比亚经济中发挥着重要作用,是多个社会阶层脱贫的一个来源。因此,传染病会对经济和福利产生重大影响。尽管存在传染性支气管炎病毒(IBV)和禽偏肺病毒(aMPV),但对它们的流行病学和影响的了解极为有限。在本研究中,基于从吉姆马地区50个未接种疫苗的集约化和庭院式鸡群中采集的500份气管拭子进行了一项横断面研究,以调查这些病毒的传播情况并对其进行分子特征分析。通过分子检测来检测IBV和aMPV的存在情况,并对阳性样本进行基因分型。相应地,分别有6%(95%置信区间2.06%至16.22%)和8%(95%置信区间3.15%至18.84%)的鸡群检测出IBV和aMPV呈阳性。特别是,仅在庭院式鸡群中检测到IBV 793B(GI-13)毒株,并且在相距遥远的鸡群中检测到相同或密切相关的序列(-距离<2%),这表明病毒有显著传播。相反,庭院式和集约化鸡群均受到aMPV B亚型的影响。可能与从国外引进亲代种禽有关的潜在流行病学联系得以确立。这些结果凸显了这些病毒不可忽视的传播情况,有必要进一步开展流行病学研究并评估控制措施的实施情况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e73d/7711717/90cdd667d6d1/vetsci-07-00187-g001.jpg

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