What happened Shares of Novavax (NASDAQ: NVAX) were jumping 9.7% as of 10:48 a.m. EDT on Thursday. There were a couple of catalysts for the stock. Novavax and its partner, Serum Institute of India, announced Thursday morning that they have filed for World Health Organization emergency use listing of Novavax's COVID-19 vaccine. Also, data from a late-stage clinical study conducted in the U.K. of the vaccine were published in The New England Journal of Medicine. This data showed that Novavax's vaccine achieved an efficacy of 89.7%. Image source: Getty Images. So what Neither of today's developments was a surprise. However, they were both positive for Novavax and motivated some investors to pile back into the vaccine stock. Of the two stories, the EUL filing is the more important for Novavax. An EUL from the WHO is needed to export vaccines to countries that participate in the COVAX Facility. Novavax CEO Stanley Erck stated, "Today's submission of our protein-based COVID-19 vaccine to WHO for emergency use listing is a significant step on the path to accelerating access and more equitable distribution to countries in great need around the world." Now what It's uncertain how long the WHO will take to complete its review of Novavax's and SII's EUL filing. In the meantime, investors can look forward to several other key milestones. Novavax is preparing to file for emergency use authorizations in several countries, including the U.K., Canada, Australia, New Zealand, the European Union, and the U.S. 10 stocks we like better than NovavaxWhen our award-winning analyst team has a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* They just revealed what they believe are the ten best stocks for investors to buy right now... and Novavax wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of September 17, 2021 Keith Speights has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.Source