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Reconstructed 1918 influenza virus has yielded key insights, scientists say
Date:9/11/2012

WHAT:

The genetic sequencing and reconstruction of the 1918 influenza virus that killed 50 million people worldwide have advanced scientists' understanding of influenza biology and yielded important information on how to prevent and control future pandemics, according to a new commentary by scientists at the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, and several other institutions.

By sequencing the 1918 virus, researchers were able to confirm that the viruses that caused influenza pandemics in 1957, 1968, and 2009 were all descended in part from the 1918 virus. Studies showed that the 2009 pandemic virus had structural similarities with the 1918 virus and explained why younger people, who had never been exposed to the 1918 virus or its early descendants, were most vulnerable to infection by the 2009 influenza virus. As a result, public health officials were able to target limited vaccine supplies to predominantly younger people, who needed vaccine protection most, rather than the elderly, who were at lower risk of infection in 2009, but are traditionally the most important target group for vaccination. Further, determining the physical structure of parts of the 1918 virus, particularly the portions that are consistent across influenza viruses, has informed the ongoing development of candidate "universal" influenza vaccines that may be given infrequently yet protect broadly against multiple influenza viruses. In addition, by comparing the 1918 virus to related influenza viruses found in animals, scientists have learned some of the changes necessary for influenza viruses to adapt from an animal to a human host. This has led to more targeted surveillance of certain influenza viruses in animals that may be more likely to move to humans.

More generally, the authors say that reconstruction of the 1918 influenza virus has furthered scientific understanding of how novel influen
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Contact: Nalini Padmanabhan
padmanabhannm@niaid.nih.gov
301-402-1663
NIH/National Institute of Allergy and Infectious Diseases
Source:Eurekalert

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