Those invited to the upcoming briefing include Anthony S. Fauci, President Biden’s chief medical adviser and director of the National Institute of Allergy and Infectious Diseases; Francis S. Collins, director of the National Institutes of Health; Rochelle Walensky, director of the Centers for Disease Control and Prevention; Janet Woodcock, acting commissioner for the Food and Drug Administration; David Kessler, chief science officer for the covid-19 response; and Vivek H. Murthy, the surgeon general. It is not yet clear who will attend. The meeting is scheduled for Monday, though that could change.