Respiratory vaccines specialist Vicebio Ltd. is to be acquired by Sanofi SA in a $1.6 billion deal, of which $1.15 billion will be paid up front. The acquisition rests on an ongoing phase I trial of the lead asset, VXB-241, a bivalent vaccine that is intended to provide protection against both respiratory syncytial virus and metapneumovirus. The interim analysis of the study showed a favorable safety and tolerability profile in adults, ages 60 and older, and validated the underlying vaccine technology, which is applicable to a wide range of respiratory viruses.