2.5 million americans are now getting vaccinated every day, a record 6 million over the weekend, and access expanding by the day. at least 24 states making the vaccine available to residents 16 and older in the weeks leading up to the president's may 1st deadline. >> i'm just so happy to have my shot. i really am. >> reporter: and tonight, promising results from the u.s. trial of a fourth vaccine from astrazeneca. the company reporting the vaccine was 79% effective at preventing symptomatic infection and 100% effective at preventing severe disease and hospitalization. >> data and safety monitoring board identified no specific safety concerns related to the vaccines. >> reporter: after several european countries briefly halted use of the astrazeneca vaccine over concerns about a handful of blood clots, the u.s. trial found no increased risk or serious side effects. >> this is a highly effective vaccine that's easy to use, easy to distribute around the world, and has an important role to play in curtailing the pandemic around the world. >> and so let's get right to victor oquendo from miami