The Merc Researchers in Kempton Park busy with several Double Blind vaccine trials for Covid

South Africa - Kempton Park - Covid-19 Vaccine trial - 19 January 2021. The Merc Researchers in Kempton Park busy with several Double Blind vaccine trials for Covid-19. They inject some of the participants with the active vaccine and some with a placebo thus the term double blind as none of the staff or participants know what they getting in the jab. This is common practice for research purpose. Video :Timothy Bernard /African News Agency