To summarise the numbers: the American laws result in 0.045% of the population being affect by salmonella related disease, whereas the British laws result in 0.00093%, that's 50 times more illness in the US per capita.
It looks like that's purely because of the salmonella vaccination which is not required by American or British law but which British supermarkets require of their suppliers. Maybe that's easier to do because the UK supermarket space is more concentrated than it is in the US?
