A third walk-in H1N1 flu vaccination clinic is scheduled for noon-4 p.m. Tuesday, Dec. 1, at the UC Irvine Student Center, Doheny Beach rooms A, B and C. Free vaccinations will be available to UCI students, faculty and staff in the Centers for Disease Control & Prevention priority groups: people between the ages of 18 and 24, pregnant women, people who live with or care for babies less than 6 months old, healthcare and emergency medical personnel, and people 25 to 64 with medical conditions that increase their risk of influenza-related complications. A valid UCI identification card must be presented at the time of vaccination.