HealthGermanyAsk Derrick: Should countries use multiple vaccines?To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoHealthGermany08/24/2021August 24, 2021We ask our science correspondent Derrick Williams if it is better for countries to vaccinate with a range of vaccines instead of using only one type?https://p.dw.com/p/3zRDNAdvertisement