Leyden Labs secures $70M to advance virus-fighting nasal spray technology


Leyden Labs, based at Leiden Bio Science Park, has raised $70 million to develop a new way to fight respiratory viruses. Their intranasal antibody technology targets viruses like influenza and coronaviruses at the point of entry—the nasal mucosa—offering a practical, non-vaccine approach to stopping infections early. 

This funding, led by ClavystBio and Polaris Partners, will drive human trials for their PanFlu program and expand their global efforts to prepare for pandemics. With recent avian flu developments, this work feels more urgent than ever.

“This strong support from investors validates our approach to providing broad, universal protection against current and future viral outbreaks,” said Koenraad Wiedhaup, co-founder and chief executive officer of Leyden Labs. “At Leyden Labs, we’re working to stop infections early by delivering antibody-based formulations directly to the nasal mucosa – eliminating the threat of respiratory viruses directly at the very gate through which they enter. The timing of this fundraising is critical – in light of recent avian flu (H5N1) developments, we feel even more urgency to execute on our mission to protect people against existing and new viruses.”  

Leiden Bio Science Park is the beating heart of life sciences innovation in the Netherlands, and we are proud to provide an ecosystem where companies like Leyden Labs can thrive and shape the future of health. Our unique combination of world-class facilities, a strong network of academic and industry leaders, and a collaborative spirit enables our companies to make tangible global health impacts. Leyden Labs’ success is a shining example of how the Leiden Bio Science Park ecosystem fosters innovation that truly changes lives. 

Read the full press release on the Leyden Labs website.


  • LUMC opens dedicated CAR-T department

    Leiden University Medical Center (LUMC) has opened a dedicated department for CAR-T cell therapy, bringing care, research and expertise in this rapidly developing field together in one place. The new department, officially opened on 24 September, marks another step in…

  • VarmX recognised with two prestigious industry award nominations

    Leiden-based biotech company VarmX has received two industry award nominations recognising its scientific approach and strategic partnership with CSL. VarmX has been shortlisted for the 2026 Prix Galien USA “Best Startup” Award, which recognises early-stage companies developing novel therapeutic approaches.…