This Week in Science

In Science this week, a group of Chinese researchers report on the use of reverse genetics to gain insights into how H5N1 avian flu can spread to, and between, mammals. In the past, avian flu viruses have crossed species barriers by reassorting with mammal-infective viruses in intermediate livestock hosts. The team created 127 reassortant viruses between a duck isolate of H5N1 and a highly transmissible human H1N1 virus.

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