There are many countries in the world where FMD is constantly suppressed by vaccinating the animals. Not in Western Europe and North America however, and hopefully it will never be needed.
But thousands of planes are constantly, and have always been, departing from "FMD vaccinating countries" where nobody can ever know if he becomes a carrier of the FMD virus.
All this shoe spraying is probably okay to make people aware that they must behave sensibly. But if it should have any real effect, then it should be done even on domestic flights in countries thousands of miles away from any FMD outbreak. A domestic passenger can never know if he walks on the same floor carpet as a foreign passenger from a FMD suppressing country. Therefore, to have any effect, the spraying should always be done all over the world on international and domestic flights, never mind if there is an outbreak somewhere in the world or not.
Or all international traffic should be banned.
There are always some funny and irrational reactions every time such disasters strike. For instance, as there are 219 outbreaks in Britain and one in France, the USA and Canada has banned all imports from all fifteen EU countries, but not from Switzerland, a non-EU country which is totally surrounded by EU countries. Highly irrational knowing that by far the most dangerous spreading of FMD virus is the wind. It is like if a Colorado bug bites a potato in Maine, then I should stop drinking Californian wine.
Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs