Washington: The H1N1 swine flu virus may have been new to humanity in many ways but in one key feature its closest relative was the 1918 pandemic virus, researchers reported on Wednesday. Their findings could point to better ways to design vaccines and help explain why the swine flu pandemic largely spared the elderly.
"It gives us a new understanding of how pandemic viruses evolve into seasonal strains, and, importantly, provides direction for developing vaccines to slow or prevent that transformation," Fauci said. Better VaccinesResearchers are trying to devise better flu vaccines. Flu viruses shift slightly throughout the year and for full protection, people must be vaccinated with a fresh formulation each year. The new findings may help in designing so-called universal vaccines that protect against all strains of influenza. Or they could mean that revaccinating young people with older vaccines could protect them from the re-emergence of decades-old strains. For the other study, published in Science, Ian Wilson of the Scripps Research Institute in California and colleagues crystallized the hemagglutinin structures of both the 1918 and 2009 H1N1 viruses to get images of them. "Parts of the 2009 virus are remarkably similar to human H1N1 viruses circulating in the early 20th century," Wilson said. "Our findings provide strong evidence that exposure to earlier viruses has helped to provide some people with immunity to the recent influenza pandemic." Throughout the recent pandemic, researchers noticed that people over 50 were less likely to be infected or suffer as serious symptoms as in regular flu seasons, which hit the elderly hardest. Until 1957, descendants of the 1918 pandemic virus circulated. That year, they were replaced by a new virus, called H2N2. Although H1N1 activity has waned in the Americas and Europe, the World Health Organization says it is still technically causing a pandemic. It will take years to calculate its toll but H1N1 appears to have largely displaced seasonal flu strains this year. It killed an estimated 12,000 Americans, according to the U.S. Centers for Disease Control and Prevention, and put more than 250,000 into the hospital. The death rate was five times the usual for children, with up to 1,800 pediatric deaths. Bureau Report
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