Weird undiscovered disease slams twins equally.
Did they catch it in Lyon, Turin or Barcelona?
They were warned about what was going to happen: they had read it somewhere beforehand.
I believe that they caught it in:
Barcelona, because: "DISEASE" anagrams to "SEASIDE" (Barcelona is the only option with a seaside), and potentially, taking most of "BARCELONA", we can get "BALANCE".Not sure if this is correct, nor full enough.