Novavax, Inc., based in Gaithersburg, Maryland, develops vaccines to counter infectious diseases. The company developed the Novavax COVID-19 vaccine, now commercialized by Sanofi. The company also develops vaccines for influenza, respiratory syncytial virus, avian flu, shingles, Clostridioides difficile, and malaria. Novavax develops proprietary immune-stimulating saponin-based immunologic adjuvants at a wholly owned Swedish subsidiary, Novavax AB. One of these, Matrix-M, is used in the Novavax COVID-19 vaccine. Wikipedia