IMMUNITY February 16, 2012 Mga pagkaing mayaman sa vitamin A, C, Zinc at Protein, nakakapagpalakas ng immune systemOn Call is a daily public service and news program anchored by Connie Sison and Ivan Mayrina. It airs Mondays to Fridays at 1:00 PM (PHL Time) on GMA News TV Channel 11. For more videos from On Call, visit