Opera superstar Andrea Bocelli is donating his plasma to coronavirus cure researchers after winning a secret battle with COVID-19.The blind Italian tenor reveals he and his wife, actress Veronica Berti, and their children all tested positive for the virus in early March, although their symptoms were relatively mild.Bocelli opened up about the health battle on Tuesday while visiting a hospital in Pisa, where he and Berti donated their blood to medical experts.According to translated quotes from local paper La Stampa, the 61-year-old told reporters, “I had coronavirus.“It was a tragedy, my whole family was contaminated.