Read this on www.schengenvisainfo.com but it sounds like what they currently require...
Italy has imposed strict rules for US travelers, following the European Union Council’s decision to remove the US from its list of epidemiologically safe countries.
Italy, being the first country to follow suit from the EU, now obliges all US travelers and those who have stayed there in the past 14 days to provide a PCR or antigen test result taken within 72 hours before reaching Italy and complete the digital passenger locator form, regardless of their vaccination status, SchengenVisaInfo.com reports.
In addition, unvaccinated travelers must undergo a quarantine requirement for five days upon arrival and perform another test by the end of the self-isolation period. Children under the age of six are exempted from the testing requirement.