The British prime minister called for a "new era of global health collaboration" at the launch of a virtual vaccine summit on Thursday which seeks to raise funds to distribute vaccines to combat infectious diseases in developing countries.

At the summit chaired by the United Kingdom, Boris Johnson urged world leaders to help raise at least $7.4 billion for Gavi, The Vaccine Alliance, which is part-funded by Bill and Melinda Gates, to protect the next generation with vaccines, reduce inequality and boost access to immunization programs.