What happened Top coronavirus stock BioNTech (NASDAQ: BNTX) was also tops with investors on Thursday. The Germany-based biotech's shares trounced the S&P 500 by closing the day more than 4% higher, thanks to some positive -- if expected -- news on the regulatory front. So what Comirnaty, the coronavirus vaccine developed by BioNTech in partnership with U.S. pharmaceutical sector giant Pfizer (NYSE: PFE), was granted Emergency Use Authorization as a booster by the Food and Drug Administration Wednesday night. Image source: Getty Images. The vaccine is currently the only one fully approved by the regulator to prevent COVID-19. Two other vaccines, from biotech Moderna and Johnson & Johnson's Janssen, are in circulation under EUAs. The Comirnaty booster's EUA covers people 65 years of age and older. It also applies to individuals age 18 to 64 with either high risk of severe COVID-19, or, as the FDA wrote in an official press release on the matter, "whose frequent institutional or occupational exposure to SARS-CoV-2 puts them at high risk of serious complications" from the disease. In a statement, BioNTech CEO Uğur Şahin said the company would "continue to monitor new SARS-CoV-2 strains, to be prepared for potential emerging escape variants." Now what BioNTech and Pfizer added that they are continuing to supply the vaccine under their current arrangement with the U.S. government, which runs through next April. According to the companies, this arrangement includes "sufficient volume for boosters." The booster shots are likely not going to affect the financial projections for either company; however, the approval will bolster Comirnaty's status as the leading coronavirus vaccine administered in this country. 10 stocks we like better than BioNTech SEWhen 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 BioNTech SE 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 Eric Volkman has no position in any of the stocks mentioned. The Motley Fool recommends Johnson & Johnson and Moderna Inc. The Motley Fool has a disclosure policy.Source