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I'll not try to precis it for you, it is an easy, quick read, but it left me afraid that we are a very small mutation away from the post World War One 'flu epidemic, that was truly world-wide and killed far more people than died in that terrible war. Almost worse, 'flu mutates all the time, so that "any one patient carries a swarm of viruses with subtle genetic differences". When H5N1 is only two to four mutations away from acquiring pandemic potential, that is not reassuring. Two laboratories working on 'flu have engineered cultures to be pandemic, so this change may not be far off.
But it's not all doom and gloom. H5N1 has been around for a long time, in wild and domesticated birds. It may be that there are many more infections of humans than we realise and that the death rate is very much less than the 60% that official figures indicate, and it may be that, like post WW1 'flu and 'pig' flu, only certain individuals are susceptible, rather than everyone. And in the natural vector, wild birds, infection rates have dropped markedly since 2011.
Just about every aspect of H5N1 that this helpful article deals with gets back to the problem of how little we know. One expert virologist commented, “Any prediction about whether this virus will go pandemic is a function of where it is, how much of it there is and how possible the human–animal contacts are. But there are big black holes of information.”