02:32Science In ActionCovid-19 vaccinesBBC World Service Duration: 31 minutes Fri 22nd May 2020, 02:32 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowMore than a hundred vaccines are in development to fight the virus Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandScience In Action Source: BBC Online