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I think perhaps people haven't got the full impact of this yet.
Scientists aren't especially worried about birds transmitting this to humans - if that were the only way to catch it, it wouldn't be nearly so much of a threat. The reason everyone's panicking is because this is a flu virus, and a very nasty one, and much more importantly, a very unstable form. What that means is that is has the very real possibility of mutating into a strain that can be passed from human to human. This is possible two ways - a bird or human carrying it may be treated, forcing a mutant strain of the virus to survive. Or, the virus might mutate in pigs, which are capable of catching both human and avian forms of flu.
Don't forget that we have experience of this form of flu before - the flu pandemic of 1918 has now been identified as a strain of avian flu, and that kill nearly 40 MILLION people. This was in a time when travel between countries was not nearly so easy: if a similar virus appeared, it could spread throughout the world before we knew what hit us.
As for exposure to disease making your immune system stronger, that's true - sadly, in the case of H5N1 this isn't a good thing: quite the opposite. Normal flu triggers various immune responses, one of which is imflaming cells to help fight off the disease. Unfortunately, not only is our immune system pretty well useless against bird flu, H5N1 also causes the inflammatory part of the system to massively overreact. What that means is that your own immune system, while useless against the virus, is swelling up your throat and lungs and choking you to death - the stronger your immune system, the more trouble you're in. Ironically, people without any immune system at all are probably better off when it comes to bird flu.
In effect, this is a time bomb waiting to go off: while it stays in birds, the human population is relatively safe, but it's likely and more than likely that, given time, this virus will mutate into an airborne human-to-human contractable disease. And when that happens, we'll be lucky is 40 million is all we lose.
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