Swiss Entry Visa

I'm hoping someone could answer my question. I recently received a Visa D that states is valid for "Suisse + 1 Transit Schengen". I am currently still in the San Francisco but need to travel to Italy before officially moving to Switzerland. Is it safe for me to travel to another Schengen state without me going to Switzerland first? My intent is to travel to Italy first, then return back to the US before the the final move to Switzerland.
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