QUADRIVALENT INFLUENZA VACCINE PREVENTS ILLNESS AND REDUCES HEALTHCARE UTILIZATION ACROSS DIVERSE GEOGRAPHIC REGIONS DURING FIVE INFLUENZA SEASONS. A RANDOMIZED CLINICAL TRIALGhassan Dbaibo, Arshad Amanullah, Carine Claeys, Allen Izu, Varsha K. Jain, Pope Kosalaraksa, Luis Rivera, Jyoti Soni, Emad Yanni, Khalequ Zaman, Beatriz Acosta, Miguel Ariza, Maria L. Arroba Basanta, Ashish Bavdekar, Alfonso Carmona, Luis Cousin, Jasur Danier, Alfonso Diaz, Javier Diez-Domingo, Ener C. Dinleyici, Saul N. Faust, Jose Garcia-Sicilia, Grace D. Gomez-Go, Maria L. A. Gonzales, Mustafa Hacimustafaoglu, Stephen M. Hughes, Teresa Jackowska, Shashi Kant, Marilla Lucero, Josep Mares Bermudez, Federico Martinón-Torres, May Montellano, Roman Prymula, Thanyawee Puthanakit, Renata Ruzkova, Iwona Sadowska-Krawczenko Henryk Szymanski, Angels Ulied, Wayne Woo, Anne Schuind and Bruce L. Innis for the Flu4VEC Study Group