Evidence of an absence: the genetic origins of the 1918 pandemic influenza virus

被引:139
|
作者
Reid, AH [1 ]
Taubenberger, JK [1 ]
Fanning, TG [1 ]
机构
[1] Armed Forces Inst Pathol, Dept Mol Pathol, Rockville, MD 20850 USA
关键词
D O I
10.1038/nrmicro1027
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Annual outbreaks of influenza A infection are an ongoing public health threat and novel influenza strains can periodically emerge to which humans have little immunity, resulting in devastating pandemics. The 1918 pandemic killed at least 40 million people worldwide and pandemics in 1957 and 1968 caused hundreds of thousands of deaths. The influenza A virus is capable of enormous genetic variation, both by continuous, gradual mutation and by reassortment of genome segments between viruses. Both the 1957 and 1968 pandemic strains are thought to have originated as reassortants in which one or both human-adapted viral surface proteins were replaced by proteins from avian influenza strains. Analyses of the genes of the 1918 pandemic virus, however, indicate that this strain might have had a different origin. The haemagglutinin and nucleoprotein genome segments in particular are unlikely to have come directly from an avian source that is similar to those that are currently being sequenced. Determining whether a pandemic influenza virus can emerge by different mechanisms will affect the scope and focus of surveillance and prevention efforts.
引用
收藏
页码:909 / 914
页数:6
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