Bird flu strains are evolving: study (AAP via Yahoo!7 News)
Some strains of bird flu are coming ever closer to developing the traits they need to cause a human pandemic, a new study warns.

Scientists identify second H7 strain of bird flu that could cause pandemic (Times Online)
The H5N1 strain of bird flu that has killed 241 people is not the only one that could trigger a pandemic, according to research in America. A few H7 strains of the flu virus have started to evolve some of the traits they would need to infect people easily, scientists have discovered.

Scientists warn of bird flu epidemic (Daily Telegraph)
A strain of bird flu has moved a step closer to developing the traits required to create an epidemic of the disease in humans, scientists warned on Monday.