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Elaris: Advances C. difficile Vaccine Beyond Toxin-Only Approaches with Matrivax Asset Acquisition

05.05.2026

Elaris FlexCo (“Elaris”), an Austrian biotechnology company developing vaccines against serious bacterial infections, today announced that it has entered into an asset purchase agreement with Matrivax Research & Development Corporation (“Matrivax”), a U.S.-based biotechnology company, to acquire intellectual property, materials and know-how related to technologies for the prevention of Clostridioides difficile infection (CDI) and related disease outcomes.

The transaction strengthens Elaris’ strategy to develop a differentiated CDI vaccine designed to go beyond traditional toxin-only approaches. By targeting multiple mechanisms of infection, Elaris aims to address key limitations of prior vaccine efforts, particularly in achieving broad protection and reducing recurrence.

Combined with Elaris’ existing global license agreement with Valneva for toxin-based antigen technology, the acquisition consolidates and secures the core intellectual property underpinning its multi-component vaccine platform. The acquired assets include patents, preclinical data, manufacturing expertise and biological materials supporting novel approaches targeting C. difficile.

“This acquisition is a critical step toward building a more effective vaccine against C. difficile,” said Jason Golan, Chief Executive Officer and Co-Founder of Elaris. “While toxin neutralization addresses an important component of disease, it does not fully address the underlying infection dynamics. We believe that targeting multiple mechanisms of infection is essential to achieving meaningful protection, particularly in reducing recurrence and overall disease burden.”

Under the terms of the agreement, Matrivax will receive an equity stake in Elaris as well as royalties on future net sales of products incorporating the acquired assets.

CDI remains a leading cause of hospital-acquired infections globally, with more than one million cases annually and high recurrence rates following treatment. Despite this burden, no vaccine is currently approved.

Contact

Jason Golan
Chief Executive Officer
jason.golan@elaris.com