If H5N1 does go human, how fast will the pandemic spread?
There is a small but realistic chance of snuffing out a newly humanised strain of avian flu before it even starts a pandemic. Excellent surveillance and rapid administration of Tamiflu antiflu tablets could stop a local outbreak.
Otherwise the virus could spread around the world within a few weeks. An international travel ban would make little difference, because there would have to be some exceptions and flu is so infectious.
By European experts the Spring influenza will more aggressive.