A senior scientist at the U.S. Centers for Disease Control and Prevention has resigned, warning that changes in leadership may weaken the country's vaccine program.

The U.S. Centers for Disease Control and Prevention panel of vaccine experts will vote on shots for respiratory syncytial virus and influenza at a meeting scheduled for June 25 and 26, according to the agency's website.

The 17 members of the CDC's vaccine advisory committee, who were ousted last week, argued their abrupt dismissal has "left the U.S. vaccine program critically weakened."