A 23-year-old man suffering from chronic heart problems has become the seventh person in Greece to be admitted to an intensive-care unit after contracting swine flu, officials revealed yesterday. The unnamed man was hospitalized at the Onassis Cardiac Surgery Center in Athens on August 7. During his treatment he suffered a heart attack and was put on a life support machine. He is currently being given anti-viral drugs. The news came as the first medical center in the capital that will be part of a nationwide network used to vaccinate everyone in Greece against swine flu was opened in central Athens yesterday. The center, at 78 Solonos Street, will be open from 8 a.m. to 6 p.m. from Monday to Friday. Visitors will be able to see a doctor without an appointment. Another six such centers are due to open in Athens by the end of the month. The vaccines are likely to be available in October.