Congress’ attending physician informed lawmakers Monday night that two staffers in every House member and senator’s personal offices are now eligible to receive the coronavirus vaccine.

In addition, the Office of the Attending Physician is offering the vaccine to four staffers of every committee chair and every ranking committee member.

The announcement, a memo from Brian Monahan to all congressional offices, emphasized that the first wave of staff vaccines is meant for “critical” employees, those whose jobs are deemed essential for “continuity of operations,” require physical presence or are likely to involve in-person interactions.