About how many global casualties would there be if the H5N1 "bird" flu virus, which kills more than 80% of it's victims, were to become a level 6 pandemic? If the entire world's population were infected, I would imagine that about 5,000,000,000 people would die from the disease. Probably even more casualties than an airborne Ebola pandemic. Not to mention global panic, riots, looting, martial law, quarantines, etc... I doubt that a virus such as the H5N1 (one of the deadliest viral diseases ever known to man) would, or could cause the extinction of the human species, but it would likely wipe out 80-90% of humanity if everyone was infected. The current H1N1 "swine" flu virus has been similar in severity to the seasonal human influenza. There have also recently been many reports that the H1N1 virus is starting to wane. I wish I had somewhere I could go to evacuate, and be safe for a period of time, in case of a H5N1 pandemic. Some place very rural, because densely populated, urban areas can quickly turn into chaotic war zones in the case of an apocalypse-like viral pandemic. The A/H5N1 virus has been around for quite a few years. How come nobody has bothered to develop an effective vaccine against it in case of a pandemic. Something as such could save Hundreds of Millions or even Billions of lives.