Imbed Biosciences Inc., a closely-held biotech that makes a product for pain and infections in complex wounds, says a reformulation of its biggest product as a nasal spray could help prevent the spread of Covid-19.

Imbed’s nanoparticles were found to inactivate or kill about 99.9% of SARS-Cov-2 viruses in an experimental study run by Virology Research Services of London, according to a report seen by Bloomberg. To be sure, those results came from a study in a controlled lab and have not yet been replicated in a follow-on or human trial.