Pursuant to the Decree of the Minister of Infrastructure and Transport, adopted in coordination with the Minister of Health no. 120 of 17-03-2020, all persons who enter Italy, even if asymptomatic to COVID-19, are obliged to self-isolation for a period of 14 days, with the exception of those who transit or stay in Italy for proven professional reasons, for a time not exceeding 72 hours.
Read the full text of the Decree: https://consginevra.esteri.it/consolato_ginevra/resource/doc/2020/03/dm_120_2020.pdf
