Washington State University Global Health Program, Nairobi, Kenya.
Division of Global Health Protection, US Centers for Disease Control and Prevention-Kenya, Nairobi, Kenya.
Epidemiol Infect. 2020 Dec 1;148:e292. doi: 10.1017/S0950268820002939.
Despite high exposure to Middle East respiratory syndrome coronavirus (MERS-CoV), the predictors for seropositivity in the context of husbandry practices for camels in Eastern Africa are not well understood. We conducted a cross-sectional survey to describe the camel herd profile and determine the factors associated with MERS-CoV seropositivity in Northern Kenya. We enrolled 29 camel-owning households and administered questionnaires to collect herd and household data. Serum samples collected from 493 randomly selected camels were tested for anti-MERS-CoV antibodies using a microneutralisation assay, and regression analysis used to correlate herd and household characteristics with camel seropositivity. Households reared camels (median = 23 camels and IQR 16-56), and at least one other livestock species in two distinct herds; a home herd kept near homesteads, and a range/fora herd that resided far from the homestead. The overall MERS-CoV IgG seropositivity was 76.3%, with no statistically significant difference between home and fora herds. Significant predictors for seropositivity (P ⩽ 0.05) included camels 6-10 years old (aOR 2.3, 95% CI 1.0-5.2), herds with ⩾25 camels (aOR 2.0, 95% CI 1.2-3.4) and camels from Gabra community (aOR 2.3, 95% CI 1.2-4.2). These results suggest high levels of virus transmission among camels, with potential for human infection.
尽管中东呼吸综合征冠状病毒(MERS-CoV)的暴露水平很高,但在东非的骆驼养殖实践中,针对血清阳性的预测因素仍不清楚。我们进行了一项横断面调查,以描述骆驼群特征,并确定肯尼亚北部与 MERS-CoV 血清阳性相关的因素。我们招募了 29 个养骆驼的家庭,并通过问卷调查收集了有关畜群和家庭的数据。从 493 只随机选择的骆驼中采集血清样本,使用微量中和试验检测抗 MERS-CoV 抗体,并进行回归分析,将畜群和家庭特征与骆驼血清阳性相关联。家庭养殖骆驼(中位数= 23 只,IQR 16-56),至少在两个不同的畜群中养殖另一种牲畜;一个家庭畜群靠近住家,一个放牧畜群远离住家。总体 MERS-CoV IgG 血清阳性率为 76.3%,家庭畜群和放牧畜群之间无统计学差异。血清阳性的显著预测因素(P ⩽ 0.05)包括 6-10 岁的骆驼(aOR 2.3,95%CI 1.0-5.2)、 ⩾25 只骆驼的畜群(aOR 2.0,95%CI 1.2-3.4)和来自 Gabra 社区的骆驼(aOR 2.3,95%CI 1.2-4.2)。这些结果表明,骆驼之间存在高水平的病毒传播,存在人类感染的潜在风险。
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