‘Unsure how effective Pfizer vaccine is against South African variant’
"It includes several mutations and Pfizer tested only one mutation – and that is not enough."
Vials with a sticker reading, "COVID-19 / Coronavirus vaccine / Injection only" and a medical syringe are seen in front of a displayed Pfizer logo in this illustration taken October 31, 2020(photo credit: REUTERS/DADO RUVIC/ILLUSTRATION/FILE PHOTO)ByMAAYAN JAFFE-HOFFMAN
