Singapore, June 26 -- Sanofi Pasteur, the vaccines global business unit of Sanofi, and Translate Bio, a clinical-stage messenger RNA (mRNA) therapeutics company, have agreed to expand their existing 2018 collaboration and license agreement to develop mRNA vaccines for infectious diseases.

The expansion of this agreement will further unite Translate Bio's expertise and knowledge from more than 10 years of mRNA research and development with Sanofi's leadership in vaccine research and development.

Under the expansion agreement, Translate Bio will receive a total upfront payment of $425 million, consisting of a $300 million cash payment and a private placement common stock investment of $125 million at $25.59 per share representing a 50 per...