Moderna CEO Stephane Bancel said Thursday the company expects more Covid-19 variants will emerge in coming months as the Southern Hemisphere enters its fall and winter seasons.Bancel, speaking to investors on a first-quarter earnings call, said people will likely need to get booster shots of its two-dose Covid-19 vaccine as the virus circulates globally.“New variants of concern continue to emerge around the world. And we believe that over the next six months, as the Southern Hemisphere enters the fall and winter, we could see more variants of concern emerge,” Bancel said. The Southern Hemisphere includes Africa, Australia, most of South America and parts of Asia. “We believe booster shots will be needed as we believe the virus is not going away.”The CEO’s comments come a day after the company announced a booster shot of its vaccine generated a promising immune response against the B.1.351 and P.1 variants first identified in South Africa and Brazil, respectively. The variants have since spread to other countries, including the U.S.cnbc.com