Daskalakis posted his blistering resignation letter on X and Instagram on Wednesday evening. In it, he said he would step down as director of the CDC's National Center for Immunization and Respiratory Diseases on Thursday, citing irreconcilable ethical and scientific concerns. "I am unable to serve in an environment that treats CDC as a tool to generate policies and materials that do not reflect scientific reality and are designed to hurt rather than to improve the public's health," Daskalakis wrote.