Gavi has paid for more than 1 billion children to be vaccinated through routine immunization programs, saving an estimated 18 million lives.

Gavi works to expand access to vaccines for children in some of the world’s poorest countries. Health experts say the move could have deadly consequences.

A medical panel appointed by US Health Secretary Robert F. Kennedy Jr. held its first meeting Wednesday, pledging to revisit the childhood vaccine schedule and promoting themes long embraced by anti-vaccine activists.