US Health Secretary Robert F Kennedy Jr has cancelled 22 projects - worth $500m (£376m) in funding – for tackling infections such as Covid and flu. During the pandemic, mRNA vaccines were heralded as a medical marvel that saved lives, but RFK Jr says he wants to shift the money to "safer, broader vaccine platforms that remain effective even as viruses mutate". Justin and Marianna look at the broader reasons behind the decision, what the science says, and the possible ramifications.

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This episode was made by Purvee Pattni with Alix Pickles and Grace Reeve. The technical producer was Dafydd Evans. The series producer is Purvee Pattni. The senior news editor is Sam Bonham.

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