Top health officials testified before a Senate committee about COVID-19. Leaders including FDA commissioner Stephen Hahn, CDC director Robert Redfield, infectious disease leader Anthony Fauci and coronavirus testing lead Brett Giroir discussed how the government was handling the pandemic. (NPR)

Most Americans will be vaccinated against COVID-19 by July, the head of the Centers for Disease Control and Prevention, Robert Redfield, told Congress. He expects there to be about 700 million doses of vaccines available by late March or April, enough for 350 million people. (Reuters)

Johnson & Johnson began a late-stage study of its COVID-19 vaccine. The trial is testing its one-shot vaccine on about 60,000 volunteers. The company expects results by the end of the year or early next year. (Reuters)

AstraZeneca’s vaccine trial remains on hold in the U.S. The Food and Drug Administration is still investigating the serious side effect reported by one trial participant, said Health and Human Services Secretary Alex Azar. The trial has resumed in the U.K. (CNBC)

Save the date for the inaugural MM+M 40 Under 40 event on September 29. Join the virtual event for the 40 Under 40 awards, networking and panels. (MM+M)