Commentary Last November, Biden advisers called for Dr. Nancy Messonnier, a career official at the Centers for Disease Control (CDC), to take a central role in briefings on the pandemic, a move aimed at elevating science and restoring public trust in the CDC. That never happened, and recent CDC moves have left observers puzzled. In April, the CDC reassigned Dr. Messonnier from her longtime position as director of the CDC’s National Center for Immunization and Respiratory Diseases (NCIRD). Then in early May, Messonnier suddenly resigned from the CDC and declined to explain the reason. On May 7, David Lim of Politico asked CDC director Rochelle Walensky, “Can you explain why she [Messonnier] was reassigned two weeks ago, away from the agency’s COVID-19 vaccine taskforce? And why is she now leaving the CDC?” “Dr. Messonnier has been a true hero,” Walensky replied, “And through her career, in terms of public health, …