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The rumour I heard was that it was just a very early case in Italy, before anyone had thought it was much of a problem outside of Wuhan. The patient was elderly and sick, and no-one thought it could be coronavirus, but was visited by lots of friends relatives, died and then there was a large funeral where many of the people who were infected from visiting the patient passed it on to others.
Again, it's just a rumour but it doesn't seem to contradict anything.
In other words, there was nothing specific about it being in Italy, it just happened to be there and happened before people were more aware of it being a highly contagious illness.
All of these are base on stereotype and as @Ramsaye said we still don’t know fully to why it’s predominate in Italy.