The U.S Department of Health and Human Services sent out this new release that includes a statement regarding the matter:

"This morning (Wednesday) Secretary Azar accepted Dr. Brenda Fitzgerald's resignation as Director of the Centers for Disease Control and Prevention. As a medical doctor and former Georgia Department of Public Health commissioner, Fitzgerald has worked to end tobacco use, as it is the leading cause of preventable death in the United States. Along with her Japan Tobacco purchases, documents confirm Fitzgerald also bought thousands of dollars of shares in several health-care companies, including Merck & Co, Bayer and Humana, which the U.S. Department of Health and Human Services deemed a conflict of interest, POLITICO reported. "Dr. Fitzgerald owns certain complex financial interests that have imposed a broad recusal limiting her ability to complete all of her duties as the CDC Director," the HHS statement reads. "This morning Secretary Azar accepted Dr. Brenda Fitzgerald's resignation as Director of the Centers for Disease Control and Prevention," the Health and Human Services department said in a statement.
Dr. Brenda Fitzgerald resigns as head of the Centers for Disease Control and Prevention following a report that she purchased stock in food, health insurance, and tobacco companies shortly after taking up her federal government position.