By Newsbreak Producer Taresh Harreeparshad - With each variant of COVID-19 detected in South Africa - there appears to be better immunity against the virus. This is revealed in data collated by the South African National Blood Service (SANBS). In a study to test the number of blood donors who have COVID-19 antibodies - they found that the number increased from 47% during the wave of the Beta variant, to 71% during the Delta wave. SANBS principal investigator of the study - Marion Vermeulen explains what the data suggests about the fight against COVID-19...