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Originally Posted by Enzp
The viri that already pass human to human are simiar to existing viri and our bodies are better able to cope with it. It is easier to make up vaccines for this too.
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Not necessarily easier to make vaccine, but the current H5N1 vaccine is taking larger amounts and 2 doses to confer immunity because humans don't have preexisting immunity to similar strains.
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Flu viri mutate easily and readily. It is likely that the thing will eventually jump to humans, most likely through a third animal. ...
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This is the current theory but the resurrection of the 1918 flu strain indicated it may have not reassorted in pigs but rather mutated directly to become infectious in humans.