I would imagine after seeing the complete destruction of the UK, the French government wouldnt entirely rule out the use of a single nuclear weapon on the Calais area, in order to save the whole of Europe. Perhaps the army would stage a coup against Chirac for refusing to nuke Calais ? It seems unfeasible now, but when a virus that turns people into murderous monsters in 20 seconds begins to spread, people will do extreme things.Is nuclear sterilization possible? How about chemical weapons?
As for chemical weapons, im not sure if France had any in 2002 or not.