FISM NewsVideos Britain Tests Mixing COVID-19 Vaccine Shots to Combat New Variant by sam February 9, 2021 February 9, 2021 916 The trial will examine the responses to an initial dose of Pfizer vaccine followed by a booster of AstraZeneca’s, as well as vice versa, with intervals of four and 12 weeks. 0 FacebookTwitterPinterestEmail previous post China Takes Aim Again at BBC as Dispute with Britain Intensifies next post U.S. Safety Board Cites Pilot Actions As Likely Cause Of Kobe Bryant Fatal Crash