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Ross.?.. A possible H5N1 vaccine A vaccine against the most deadliest and common strain of avian flu, H5N1, has been engineered and tested by researchers at the University of Pittsburgh’s Center for Vaccine Study and Novavax Inc. Relating to a scholarly research published by the general public Library of Technology in the Jan. 30 problem of PLoS ONE, the vaccine produced a strong immune response in mice and protected them from loss of life following disease with the H5N1 virus. The vaccine has been tested in humans in an early-phase medical trial. Recent outbreaks of avian flu around the world possess prompted health officials to warn of its continuing threat to global health and potential to trigger a flu pandemic.