Three of the new cases who contracted covid-19 on Friday visited Italy before returning home. A fourth, the wife of one of the first three, caught it from her husband. A fifth, a passenger of the Diamond Princess cruise ship, was hospitalized in Japan, released after recovering and tested positive again back home in Israel. They were all taken by ambulance to the special quarantine building outside Sheba Medical Center. The Health Ministry reports 4,500 Israelis are currently in quarantine, most of them in their homes, and estimates that several thousand more will be ordered to go into isolation to contain the spread of the virus.