arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1603.09397q-bio.PE
收藏

解释季节性甲型流感(H3N2)的地理起源

Explaining the geographic origins of seasonal influenza A (H3N2)

Frank Wen, Trevor Bedford, Sarah Cobey

摘要:

大多数抗原性新颖和进化成功的季节性甲型流感(H3 N2)毒株起源于东亚、南亚和东南亚。为了理解这种模式,我们模拟了代表温带北部、热带和温带南部的宿主集合种群中流感的生态和演化动力学。虽然季节性和空中交通经常被用来解释流感的全球迁移模式,但我们发现其他因素可能具有类似或更大的影响。值得注意的是,一个地区的基本繁殖数($R_0$)强烈影响其病毒群体的抗原进化及其毒株在全球传播和固定的概率:一个地区的$R_0$高出17-28%可以解释观察到的模式。相反,季节性增加了热带(季节性较低)人群输出进化成功菌株的可能性,但仅凭季节性并不能预测这些菌株将是抗原性晚期的。不同宿主人群的相对规模、出生率和死亡率以及H3 N2首次出现的地区以不同但相对较小的方式影响流感的地理分布。这些结果表明,一般原则,规定抗原演变的病原体的空间动态,并提供预测人类生态的变化可能会影响流感的演变。

英文摘要:

Most antigenically novel and evolutionarily successful strains of seasonal influenza A (H3N2) originate in East, South, and Southeast Asia. To understand this pattern, we simulated the ecological and evolutionary dynamics of influenza in a host metapopulation representing the temperate north, tropics, and temperate south. Although seasonality and air traffic are frequently used to explain global migratory patterns of influenza, we find that other factors may have a comparable or greater impact. Notably, a region's basic reproductive number ($R_0$) strongly affects the antigenic evolution of its viral population and the probability that its strains will spread and fix globally: a 17-28% higher $R_0$ in one region can explain the observed patterns. Seasonality, in contrast, increases the probability that a tropical (less seasonal) population will export evolutionarily successful strains but alone does not predict that these strains will be antigenically advanced. The relative sizes of different host populations, their birth and death rates, and the region in which H3N2 first appears affect influenza's phylogeography in different but relatively minor ways. These results suggest general principles that dictate the spatial dynamics of antigenically evolving pathogens and offer predictions for how changes in human ecology might affect influenza evolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑