HHS Secretary Robert F. Kennedy Jr. expressed concern that Gavi made questionable recommendations about COVID-19 vaccines and neglected vaccine safety.
The Centers for Disease Control and Prevention's Advisory Committee for Immunization Practices had yet to have its first meeting when Michael Ross withdrew.
Gavi, the Vaccine Alliance has been the Gates Foundation's biggest grantee in the vaccine industry, as it had received $7.7 billion before this announcement.
The announcement comes after Democratic lawmakers sent a letter to the Trump administration, demanding that it stop sharing data of Medicaid enrollees with DHS.