Former Italian Prime Minister Silvio Berlusconi has tested positive for coronavirus and is currently in isolation at home, the staff of the 83-year-old media tycoon said on Wednesday.Alberto Zangrillo, Berlusconi’s personal doctor at Milan’s San Raffaele hospital, told AdnKronos news agency the former premier had no symptoms but had decided to test for Covid-19 because of his recent stay in Sardinia.sBerlusconi recently returned home from a holiday in Sardinia, which saw a sharp increase in…