If one goes by the ACIP Membership Rooster this seem to be the case: https://www.cdc.gov/acip/membership/roster.html Likely, the compensation scientists receive for being a committee member is not great so the committee has to be constantly refilled. Appointees to such committees are de facto apolitical because there aren't enough world-class specialists available for the executive to choose between. So the Trump team will have to choose, actual experts in immunology or loyal MAGA goons...