Transcript for Vaccine rollout remains dire as concerns about international COVID variants grow
All right, we turn to the other top story, the latest on the coronavirus emergency. As the globe nears a staggering 100 million covid-19 cases worldwide, with more than 25 million right here at home. Concerns about those variants are growing as the race to vaccinate Americans becomes even more urgent. Stephanie Ramos is at a mass vaccination center at MetLife stadium in New Jersey with more. Good morning, Stephanie. Reporter: Robin, good morning. That's exactly right. This is a covid vaccine megasite. One of six across the state of New Jersey. They'll re-open tomorrow but today they're expecting a big shipment of the vaccine. Once they're all set they plan to provide at least 2400 vaccinations per day starting with health care workers. This morning, with states desperate for more vaccines, president Biden with a new goal. I think we may be able to get that to 1.5 million a day rather than 1 million a day. There's going to be a lgistical challenge that exceeds anything we've ever tried in this country but I think we can do that. I feel confident that by summer we'll be well on our way to heading towards herd immunity. Reporter: The president's confident but cautious warning the death toll could top 660,000 before we start turning the corner. We're still going to be talking about this in the summer. We're still going to be dealing with this issue in the early fall. Reporter: The race to vaccinate the world as pressing as ever. Concerns escalating as more variants of the virus are reported in the U.S. On Monday two new states reporting occurrences of the highly contagious uk strain and overnight Minnesota announcing a local resident who had recently traveled to Brazil has the country's first known case of the Brazil variant. Moderna, one of the two vaccines currently used in the U.S., now looking at how its shots hold up against these new strains. The company saying experiments show it protects against the uk variant, but that it provoked a weaker response against the south African variant and is studying a couple new options including a possible booster shot. We need to keep watching it and testing against it and making sure until we've got it beaten back that we're planning ahead and we're being careful. Reporter: On Monday U.S. Pharmaceutical company Merck announced it's ending development of two potential vaccines saying while both looked safe in clinical trials immune responses were low but scientists across the globe are trying to get as many vaccines approved as possible. According to the world health organization, there are more than 60 vaccines around the world currently in human trials. 11 of them in the final testing stages and nearly 200 others are in preclinical development. But overnight Dr. Anthony Fauci saying the disproportionate available doses across the country are of great concern to There are some areas of the country where there's vaccine lying around and it's not going into people's arms. I just got off the phone with a city and a state in which they have so many more people lined up who want to get vaccinated and don't have vaccine so that kind of dichotomy and disparity is something that we really need to address, find out how to fix it and fix it. Reporter: FEMA says they're planning to establish covid vaccination sites like the one here. Still unclear where exactly those sites will be but FEMA actually pd a role in managing state and local covid testing sites at the beginning of the pandemic, George. Okay, Stephanie, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.