The new H7N9 strain of bird flu has re-emerged in China, after laying dormant for several months. Amid a current outbreak, experts are concerned about mutations in the virus and are concerned it could spread between humans.
In 2013 there were a total of 144 case of H7N9 avian influenza around China. But this January alone there have been 101 recorded cases, 10 of which resulted in death, according to incomplete disease reports compiled by Chinese authorities.
New research shows that the H7N9 bird flu virus spreads between ferrets in close contact with each other, suggesting human-to-human transmission is possible.
Chinese researchers hybridized the H5N1 bird flu virus with the highly virulent H1N1 swine flu strain, creating mutants that can spread between mammals.
As authorities report the arrival of H7N9 bird flu in central China, two new studies show that the virus can change quickly, and may be more infectious than previous strains.