Panacea Biotec files suit against Sanofi for patent infringement SECTIONS Last Updated: May 17, 2021, 02:48 PM IST Share Synopsis "The suit filed against Sanofi comes at the heels of Sanofi having received marketing approval for a Whole Cell Pertussis based Hexavalent vaccine by the Drugs Controller General (India)," Panacea Biotec said in a regulatory filing. Reuters Panacea Biotec on Monday said it has filed a suit before the Delhi High Court seeking to restrain Sanofi Healthcare India from marketing a fully liquid hexavalent vaccine. The national capital-based firm said a case has been filed in order to stop infringement of its patent for fully liquid whole cell pertussis based fully liquid Hexavalent vaccine EasySix.