Drug executives: Big jump in vaccine supply is coming soon

In this Feb. 19 photo, people wait in line at a 24-hour, walk-up COVID-19 vaccination clinic hosted by the Black Doctors COVID-19 Consortium at Temple University's Liacouras Center in Philadelphia. (AP Photo/Matt Rourke, File)

WASHINGTON — COVID-19 vaccine makers told Congress on Tuesday to expect a big jump in the delivery of doses over the coming month, and the companies insist they will be able to provide enough for most Americans to get inoculated by summer.