What happened Renewed coronavirus fears are back to haunt companies relying heavily on the economy's reopening. Avis Budget Group (NASDAQ: CAR) is one of them: The stock extended its recent downfall and had lost 5.1% at 10:35 a.m. EDT on Thursday. So what New COVID-19 variants are turning out to be a big threat even as economies across the globe strive to get back on the growth track. In one of the biggest global developments, Japan just declared a state of emergency ahead of the Summer Olympics as coronavirus cases mount. At home, states like California are reporting a rising number of coronavirus cases after months of decline even as I write this. To top that, latest estimates from the Centers for Disease Control and Prevention reveals the more contagious delta variant of COVID-19 as the dominant coronavirus strain in the U.S. Image source: Getty Images. None of this bodes well for Avis Budget, as another potential COVID-19 wave and lockdowns would mean further travel restrictions and pullback in demand for car rentals. Avis Budget shares more than doubled year to date through June as vaccine rollouts and easing of travel restrictions spurred demand. Worse yet, the fresh COVID-19 worries come at a time when competitor Hertz Global Holdings (OTC: HTZZ) has also bounced back into the game: Hertz emerged from bankruptcy last week with a stronger balance sheet and believes it's well positioned to take advantage of the spurt in demand for car rentals in the U.S. Fresh coronavirus concerns, though, appear to be hitting Hertz shares as well, which were down nearly 7% as of 10:35 EDT today. Now what Avis Budget shares shot through the roof this year, so any developments that could potentially hit demand for the company's services are bound to hurt the stock's price. As it is, Avis Budget refrained from providing full-year guidance last quarter for two reasons: the uncertainty around the coronavirus pandemic and the global chip shortage that's hurt the company's plans to expand its fleet. The chip shortage is here to stay, fears of a surge in coronavirus infections loom large, and a competitor is back in the market. That pretty much sums up why Avis Budget shares are losing ground. 10 stocks we like better than Avis Budget GroupWhen 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 Avis Budget Group 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 Neha Chamaria 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