What happened Shares of Moderna (NASDAQ: MRNA) rose 4.9% to a record closing high of $246.66 on Wednesday, as health officials warned of the potential for another wave of COVID-19 infections later this year. So what New coronavirus strains, such as the Delta variant, are spreading rapidly in the U.S. and other parts of the world. They're driving a rebound in COVID-19 case counts in many areas, which is fueling calls for governments to step up their vaccination efforts. Image source: Getty Images. Fortunately, Moderna's vaccine helps to protect against several coronavirus mutations, including the Delta variant, though at levels below that of the original strain. To bolster their ability to defend against emerging variants, Moderna and rival drugmaker Pfizer are working on booster shots that could help to ramp up people's abilities to combat the virus. Now what If COVID-19 booster vaccines turn out to be needed on a regular basis, say annually or even semiannually, they could become a significant source of recurring revenue for Moderna. Additionally, the biotech's coronavirus-related revenue will help fuel its highly regarded research and development program. Moderna has a well-stocked pipeline of experiential vaccines and treatments for an array of diseases, and CEO Stéphane Bancel believes it could have as many as 60 drugs in clinical trials within a few years. If just a few of these drug programs succeed, investors could be in store for even larger gains in the years ahead. 10 stocks we like better than Moderna Inc.When 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 Moderna Inc. 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 June 7, 2021 Joe Tenebruso has no position in any of the stocks mentioned. The Motley Fool recommends Moderna Inc. The Motley Fool has a disclosure policy.Source