Yes, but will it jump?

[摘要] As the world braces itself for a potential flu epidemic experts are trying to establish whether the H5N1 virus is likely to have the ability to spread between people. H5N1 has lead to the slaughter of hundreds of millions of poultry in Asia, and has killed about half of the 156 people so far identified as having been infected. Some virologists argue that H5 viruses may be inherently incapable of transmitting efficiently from human to human.